Bet Formula

  • The BET technique was used to determine the surface areas of metal-organic frameworks (MOFs), which are crystalline compounds of metal ions coordinated to organic molecules. Possible applications of MOFs, which are porous, include gas purification and catalysis. An isoreticular MOF (IRMOF) with the chemical formula Zn 4 O.
  • Here’s a simple horse betting formula we created. A = the finish position of a horse in its last race. B = the number of times the horse has finished worse than third in its last six races. C = the numeric value given to the horses’s chances today, with the lowest number being the best bet.
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Formula 1 Betting Odds. World Championship. View Free Premium Football Tips. View Over 1.5 goal selections that can be used as singles once odds reach 2.00 and together as a multi bet.

In the next 5 minutes, the 'combination' will finally click and everything will fall into place as this exceptionally detailed step by step blueprint to make a killing at horse racing will allow you to replicate the exact formula we use to generate thousands of dollars every 30 days!

But first, here's a sneak peek of what you'll discover...

7.78K subscribers. BETTING STRATEGY WEEK 1: 2 Bets £474 Profit! 82% Strike Rate! (Football Gambling System) Info. If playback doesn't begin shortly, try restarting your device.

You're going to see...

How to pick the right horse to bet on...

How much to bet on this horse...

How to generate thousands of dollars from this simple formula...

And you'll see how to do it quickly, and easily.

If you've struggled to make any profits betting on horses, always using stupid systems or tipping services, or maybe you're just sick and tired of wasting day after day searching for THE system...

... then you need to read every single word on this page very carefully - you're about to see exactly what this devastating new horse racing formula will do for you.

From: Stephen Browne and Frank Belanger
Date:
Re: Horse Racing Breakthrough

Dear punter...
Get ready...
... you're about to have your eyes wrenched open. In fact, I'll be bolder than that...
... you're about to have your entire horse racing life changed - permanently.
Sure, you probably don't believe me, and that's fine. In just a second you'll see evidence of exactly what I'm talking about.
And I've got to warn you - it's going to hit you hard, like a straight shot right to the gut. But before we get into that, let's talk about you for a sec...
You're frustrated about your results aren't you?
You're just sick and tired of struggling to make money betting on horses.
You've waded through all the BS systems online - the lies, the half truths... all the misinformation, all the scammers.
And all that has brought you right here, to this point...

OK...before we go any further, please let me introduce myself.
My name is Frank Belanger. I'm the author of many best selling sports betting ebooks at clickbank.
I started up betting on sports online as a hobby about 12 years ago. Ever since then, I developed and created many sports betting systems or methods of play that could be used to beat the bookies and make good money.
Now I hear you say...

It's ok, I know how you feel and it is perfectly normal to be skeptical so, please read what I have to say very carefully. In 2005, I released an amazing college football system (American Football NCAA) to my subscribers. Hundreds of people got their hand on this system and we all made a killing with it. We’ve earned thousands of dollars from this system.
Do you know what ?
In 2006, more than 95% of all reputable online sportsbooks changed their rules about the kind of betting we were doing. They didn’t have any choices because they were losing millions of dollars every week.
So, now do you think I know my stuff ? Yes I do! I’m your man!
After the phenomenal success of my unique sports betting systems, I was contacted by literally hundreds and hundreds of people from all walks of life. To be honest, I was overwhelmed. Many happy customers thanked me and complimented me on the simplicity of my sports betting systems, saying how simple and easy they are to use.
But the number one question I was being asked over and over again was whether I could actually create a powerful horse racing betting system and take you by the hand and walk you through the whole process of quickly building a solid bankroll and building a real horse racing fortune. And the simple answer is...YES I can!
So, two years ago, even if I was having success using my secret systems in every other sports, I didn't have anything specific for horse racing.

One day, I met Stephen Browne, a professional horse racing punter. He was working on a powerful horse racing system. We immediately started to work together and joined our forces.

After 2 years of hard work and thousands of day testing the system, we finally discovered THE ONLY FORMULA that can beat the bookies. In fact, we found a way to combine some powerful techniques and apply them to specific facts that only happens at horse racing.
We did thousands of live tests and BANG! It worked like a charm!
So NOW...are you ready?

Go Lock The Door, Take Off The Hook, Make Yourself Comfortable & Read Every Single Word Of This Letter, Because It's That Important!


Here comes your revelation...

I mean literally anybody. I'm not kidding here, or just hyping you up. It's completely true.
You don't need any experience, you don't need to know how to pick the right horses, and you certainly don't need to be a horse racing expert...
Put it this way:
If you found this page, you're smart enough to make a killing betting on horses online. It's that simple.
Heck, let me put it another way... if you can open a sportsbook account, you can make money betting on horse.
Insane amounts of money. More than you could possibly spend.

If we do it, YOU CAN DO IT TOO! We're here to help to do just that. Our new ebook explains in detail exactly the secret system we use to make thousands of dollars or pounds every month.
There's no jargon and no waffle, just straight-forward facts and clear instructions. I'll show you in step-by-step detail how to use our unique horse racing betting system and exactly what you have to do, and how you should do it. Nothing is left to chance. We'll show you everything.
Seriously, once you get down to it, making money from horse racing is no harder than microwaving your dinner or making a sandwich. And you can do those things right?
Well, congratulations. You've got what it takes to make at lot of money at horse betting online.
And yeah, I know it's tough to take that in right now - you think I'm either kidding around or just outright lying don't you?
Well, I'm not doing either, and if you just keep reading, you'll see exactly how simple it is.

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But first...I have a few questions for you:

  • Do you ever feel frustrated because you know that you have a great systems or punting service but still you struggle to make money?

  • Do you ever feel like you are running on a never-ending treadmill just trying to keep your bankroll even and not lose money?

  • Have you ever said to yourself, if other punter's can make money betting on horses, so can I?

  • Do you ever feel a sense of complete overwhelm and frustration -- completely confused with all the back and lay systems out there?

  • Do you just know -- deep down inside -- that you have what it takes to make a nice profit betting on horses?

If you answered 'YES!' to any of these questions, then I have some really important news for you…
You're NOT alone. In fact, that list of questions was created from years of my own personal experience, and from learning about horse racing for myself. Suffice it to say: I've been there!

To say the last few months have been extremely exciting for me, would be an understatement! As I told you before, a couple of years ago I began working on this brand new project with my partner Stephen.
That project was the creation and launch of a mind-blowing horse racing formula called, The World Horse Racing Formula.
For over 2 years we worked 7 days a week formulating and implementing our secret formula. Finally, when everything was ready, using this magic formula for just 30 days I had added an additional $53,149 to my racetab account!
Yup, you read that right. In just 30 days I put $53,149 in my pocket!

And that got me thinking...
Guys like you and I, what we need is a complete horse racing roadmap. Something that shows us how to make money betting on horses online quickly and easily... and something that works almost instantly...
Because remember, we already agreed that making money at horse racing betting is easy, didn't we? We just need the right formula.
You see, We wanted to develop a horse racing system that was so simple, anyone could follow it. And not just follow it, actually earn money from it.
And we wanted to make sure you could do it with a very small bankroll, and get you started making money as soon as possible.
So we finally did it, and we put it all into one simple ebook...
Introducing... The World Horse Racing Formula

  • Generate serious profit quickly and easily

  • Finally get the horse racing success you deserve

  • Make money anytime you use it

If you're one of the thousands and thousands of people out there looking for a way to make money betting on horses, your search is over...
This is what you've been looking for.
A complete, foolproof roadmap. It's simple, and it works... fast
And it's not going to tell you to spend hundreds on this and that... it's not going to ask you to wait weeks until you start seeing money... heck, with this stuff you can make money from DAY ONE...
Let me just repeat that...

You could make money right now, today.
Seriously, how often can you say that? Sadly, not often enough right?
Well you can do it with The World Horse Racing Formula...
You see, that's the power of our amazing horse racing system - it's just about selecting the right horse and staking the right amount on it, and then making high profits everyday...
... and don't worry, I know that sounds complicated - but I promise you it's really very simple once you follow the easy outlines inside The World Horse Racing Formula.

By the way...

...Look Over My Shoulder As I Make Money At Horse Racing Live In Front Of YOU!

First, I look for specific things and the formula tells me to pick 2 horses for a win in this race...

...#2 FLAXTON and #5 O'CANNY for Race 5 at RICCARTON (NZL).

Second, I place my bets on both horses for a win at my online sportsbook...

...Here's my Receipt...

I sit down, relax, and watch this race LIVE on my computer! See how easy it is...watch it NOW with me! Who do you think is going to win?

...And the winner is...?

#2 FLAXTON at 4.90!

As you can see, I made $290 in only 2 minutes! This is how simple it is! Easy as cooking water!

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You see, in just a few moments from now, the days of being subjected to always lose money betting on horses will finally be at an end and starting today...and we mean today... you really will uncover a little known secret that could catapult you to thousands of dollars per month at horse racing... in a staggeringly short amount of time.
Yep, we know... it's a pretty wild claim, and obviously you will have heard this kinda' pitch many times before...
...but let's take a step back for a moment and allow us to explain the one simple reason why this system is SO DIFFERENT to anything you've seen, read or even heard about before...

Absolutely! After months of testing we found that this formula works even better in USA! Even Stephen, my partner, was amazed by the results we were getting with this formula on the USA tracks.

You can really use this awesome horse racing formula with any track in the USA.

...literally every last one of them.
Here's Why...
Now, we can pretty much assume that since you began looking online or offline for a way to make some profit at horse racing, you've been led into trying one of the following in an 'attempt' to make money at horse racing online...

Horse backing systems...
Horse laying system...(betting a horse won't win)
Buying tips from a so called horse punter GURU...
Reading the form guide and all the horse racing newspapers...
...and obviously, the list goes on.
Of course, maybe you've had success, (and we sincerely hope you have)... but what we can guarantee is that the reason why you've used these systems is because the horse racing 'guru's' you've been listening to and ebook and courses you've been buying have been telling you to do so...
Now don't get us wrong, there's absolutely nothing wrong with some of these system but I can guarantee you that all of these systems will lose over the long run.

...And for almost all horse racing punter - the 99.5% of people who are desperately struggling to make money betting on horses, the reality is that even with the best will in the world, the likelihood is they will never get anywhere with the systems they buy.
It's a regrettable fact... but unfortunately true.
If you've been 'burnt' before then obviously it will have hurt... but the only way to move forward is to extinguish the past, forget about your previous failures and concentrate on the future.
...That's how every successful horse racing punter thinks (without exception)... and it's how you should be thinking too.

The point is this...
The only thing you need to know right now is that there is a NEW way to make a lot of money at horse racing betting... it's something you've never been told... and it doesn't involve any of the intense frustration and drawbacks that you'll have probably experienced before.


Listen, even if you've never made a penny at horse racing betting, and you've no idea where to start... The World Horse Racing Formula contains all you need to get started, and begin making money...
But don't take my word for it...

Look At What Our Beta Testers Have To Say

Check Out What Michael Has To Say...

'You Showed What To Do To Make Real Profit At Horse Racing'

Frank,
Thanks for a wonderful A-Z Guide of online horse racing. You showed what to do to create success. It is clear that you guys teach from years of your personal experience.
It is now time for us to put into practice what you taught, follow your great formula and make a lot of money.
You gave real value. You over-delivered!
Thanks again,
Dr. Glen Alexander
England

'I rate this amongst the best racing system I have ever come across'

You have another fantastic and proven product Frank.

Anyone who uses this horse racing betting system and sticks to the rules, cannot possibly fail to earn a huge income every year from horse racing.

I rate this amongst the best racing system I have ever come across!

Sean Scott
Canada

The World Horse Racing Formula contains all of the cutting edge techniques I've used to quickly build up a PASSIVE horse racing income of around $50,000 every month.
And don't get me wrong, I make more money from other sports betting systems and other techniques... but this comes from me basically doing almost nothing. I spend about 30 to 60 minutes online everyday, and that's it!
Just regular profits every single day.
In fact the formula shows, exactly how quickly this whole thing can make you money...
And that just proves what I was saying before... making money at horse racing betting isn't difficult. You just need a proven system/formula to follow...

Picture it...
You go ahead and download The World Horse Racing Formula right now...
And in just a short while, you've got your first winning bet - but better than that, you've gotten a nice profit on this bet.
You're already making money... the selected horses win the races... and you're ALREADY making BIG PROFITS!
Sounds crazy right?
Well, to be blunt, it's not crazy at all. It's exactly what's going to happen on your first day!
You just think it's crazy because of all the bad information you've been fed. All the guys selling you their dumb, overrated systems want you to think it's hard to make money at horse racing.
They want you to think that it's some big secret that only a select few people can understand and replicate.
But it's not like that at all... making money betting on horses is no tougher than making a cup of coffee.

And that's why you need The World Horse Racing Formula... because it's going to show you exactly why it's that easy to build a successful, insanely profitable horse racing empire.

In World Horse Racing Formula the exact steps you need to take in the exact order you need to take them are laid out for you to follow. Every last step is explained for you in full detail from A to Z. Nothing is left out, nothing is left to guess-work and nothing else is needed to piece it all together.
Making money betting at horse racing betting the old way is very hard.

But what if...

  • there was a Horse racing system that could generate money almost immediately

  • there was a Horse racing system that anyone could easily use and have success

  • there was a Horse racing system that could start generating substantial income right away

  • there was a Horse racing system that doesn't need any handicapping skills

  • there was a Horse racing system that only needed to be learned once and then use over and over again as long as you want

  • there was a Horse racing system that is only mechanical and mathematical

  • there was a Horse racing system that never failed

  • there was a Horse racing system that is designed to make you thousands of BIG $$$ every month

Would you be willing to give it a shot?

I'll BET you would!


You could waste years of your time studying tons of horse racing betting courses and books whilst your account balance slips away. Forget all those, this is the only book that uncovers and exposes the real horse racing betting system with this amazing breakthrough approach. You could be just minutes from lifelong prosperity.
...but listen... let us repeat one of the most crucial aspects of the World Horse Racing Formula:

It simply doesn't matter if you don't know the first thing about horse racing, the win bet, the each way bet, the form or any of the things that might have held you back before...
...if you can read and watch then you are already over qualified... and we provide all the websites, tools, instructions and advice so this is as 'push button' as it could ever possibly be.
Basically, this is the perfect opportunity for either those who are struggling to make money betting on horses, people looking for a realistic way to supplement their income... or even more experienced horse racing punters who are already making a decent income at horse racing, but simply want to make ALOT more!
Listen, there is an even more important element to this and it is one of the major reasons why it's so essential that you take action now...

There are no secret loopholes to learn, there’s nothing to hide, no hours of learning masses amounts of useless information …just apply the formula.

There is also nothing the bookies can do about it either because this has been staring them in the face since the conception of horse racing.

If you are interested in the history of horse racing, and how to go through all the arduous calculations to come up with your own possible winner, then this system is not for you because no Form Guide is necessary.

We have developed a numbers formula only, for you to apply to any tipping service available on the day.

You don’t need to know how the professional horse punters get to the final favorites, and you don’t need a 90 page glossy manual with DVD’s to show that it really can be done, all you need to do is apply the Formula.

Here are some of the calculations you will never have to do.

Consult the Form Guide for a start; this guide shows all horses past and current racing statistics and without it you have very little chance picking a winner.
You won’t have to worry about the weather conditions

How many previous races the horse has won

Who the jockey is and what his track record

The Type of race and likely winners

The Track and field conditions

The Venue and field size

The Barrier position

Weight Variances

The Age group

The Odds

The Class

The Fitness

The Distance

The Type Of Bet

How much you will win

Fractional and decimal odds

Ratings expressed in terms of price

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Percentage movement and price reduction

An Open or restricted handicap, or a maiden race

And all the codes and abbreviations because there are many

There are also many many more important calculations I could list however, I have never once consulted a form guide, and developed this formula to be applied to all the time consuming work that has already been done for you.

All you will ever have to do is allow yourself 1–2 hours any day of the week to sit down and focus on the races from any given time in the system.

Plus, when you get the formula down-pat, you can keep working on the computer doing whatever, read, anything really.

Formula

Spreadsheets?

You don’t need them either that’s all done for you, we will show you how to set it up in minutes ready for the (1-2hr) days racing, in fact you don’t even need to do that once you get use to the formula and you have your timing right.

This is not a time consuming system, this is a proven formula that works and gets you the winning results you want in less than two (2) hours.

I always use sports betting and now horse racing as an investment. This is not a get rich quick scheme. This is however, a sure way to make a lot of money.

Layoffs, corporate downsizing, economies in tatters... Ultimately, there is no such thing as job security anymore and everyone knows that 2010 is going to be a seriously tough year financially... again!
In other words, there could be a very strong possibility that you will need some sort of a financial back up if the unthinkable happens to you...
...but even if it doesn't, wouldn't an extra $5,000, $10,000 or even $25,000 per month be kinda' nice?

It doesn't matter if you're a work at home mom that wants to make a bit of extra cash, or even a corporate executive looking for a way out of their mind-numbing day job...
...literally anyone could do this. A student, mother or grandfather. Anyone.
Remember the reasons why?
You do not need any experience or big investment... and the best thing is that once you have downloaded the ebook we will give you a complete end-to-end guide to get everything set up quickly so you can start cranking out money faster than you ever imagined was possible.
Ok... so hopefully by this stage you'll realize just how powerful the 'World Horse Racing Formula' formula is, how much you'll benefit and the insane levels of additional income that you could create...
But the question you're most likely asking yourself now is...

Well, the real question you should be asking is how much is it worth to you to have two guys already generating thousands of dollars a month at horse racing betting, taking you by the hand and literally forcing you to do the same??
The answer should be obvious... It's 'Priceless'
Remember, we reveal absolutely everything. All the tips, tricks, and strategies that allow us to make more money each month than most people make in a full year!
Here's the bottom line...
If you're serious about making real money betting on horses day in day out, then this unprecedented, and unique system is for you...

This isn't some sort of flash in the pan either... it is something you use when you want, show off to your family and friends (especially the one's who doubted you.. that's the fun part :) )...and more importantly, this is something that YOU will be proud of.
Honestly, we've battled with how to price this for weeks...
Originally we 'toyed' with the idea that $497 would be a fair price to ask. After all we are giving away the entire formula that allows us to generate up to $50,000 a month ... Literally every last secret.
However, after seeking the thoughts of a number of esteemed professional horse racing punter, the consensus was that we were being utterly reckless...
Some suggested $1997, others said $5000, and even one of them even told us he wouldn't even consider releasing this information for any less than $10,000 for each individual ebook!

And as you know, many horse racing systems are sold in Australia and in the UK for more than $10,000! Yes you read it right...$10,000!
The truth is though, even though similar systems sell very successfully for these extremely high prices, in the current economic climate, we didn't feel that it would be fair.
It would most likely put it out of reach of those who need it the most. So.. to give everyone a chance, we have decided to offer you...

When we were writing this new amazing ebook, We wanted to find a way to make sure people knew that it was a win-win situation...

And that's why we went with a crazy 2 month guarantee.
That means you get a full 56 days with The World Horse Racing Formula...
So you can try it out for 2 whole months. Read it a bunch of times...
Even better, you can actually put it to the test. You can use it for real, and see how much money you can make.
And the whole time, you have the peace of mind of knowing that if you don't make money, or if you're unhappy with it for ANY reason at all, we'll give you every last penny back.
No questions...
No excuses...
No arguments...

We'll just refund your money there and then.
And get this... you know how some guarantees, ask you to prove that the product didn't work for you?
Well don't worry, I'm not going to pull any of that BS.
Our 56 day guarantee is completely unconditional... so you don't even have to give us a reason. In fact, you can get a refund if you don't even download The World Horse Racing Formula.
I mean, you could buy it right now, and if you change your mind before you even download it, you still get a refund.
Look, if you've seen a couple of online horse racing system before, you KNOW that most of them don't have a guarantee like this.
And that's because we know The World Horse Racing Formula can help you. So we have no problem backing it up with a quite frankly, crazy guarantee.
So do it. Take advantage of us right now, and download The World Horse Racing Formula.
If you don't like it, we'll give your cash back. No questions.

Listen, we both know that guarantees like that are pretty rare. A guarantee like that backed by a product this good is pretty rare in the horse racing betting industry. It just doesn't happen.
But earlier, I promised you a crazy price... and I really wasn't joking.
For a VERY limited time only, we are going to allow you to literally steal this ENTIRE formula from us at an almost insane $497 $197.


** But... Be Warned **

This special price is only temporary and No Matter What Happens, It WILL be increased back to the usual $497.00, maybe as soon as the next few hours...

In other words, there is only one chance and to be honest, you really don't have the time to mull over this... If we get overrun by orders right now, we may have to pull the system without warning... at ANY time.
It will happen, and most sensible people wouldn't even dare refresh this page in fear of the download button being replaced by a 'Sold Out' sign...!
(You can reserve your spot directly below...)
However, just before you do, we do have one last important thing to say...
...and that is: We are not here to take your money if you're not serious.
What we really want are people who are willing to use the formula and tools... (in other words the ENTIRE proven blueprint)... and who have the drive to turn their dreams into reality by putting this very simple formula into action and generating themselves a massive consistent income for months, years, or possibly decades to come.
In other words, if you're skeptical then please move over and let someone in.
Listen, it's your decision... all the copies WILL be sold extremely fast and whether it's you or someone else who 'gets in' won't directly affect us. The smart people will take this opportunity and have direct access to our formula and everyone else will be left in the dark... trailing in their wake.
In fact, once you discover this simple formula, nothing or no-one will be able to keep you from all the success and horse racing wealth you DESERVE.
Truthfully, not everyone will be able to take advantage of this opportunity. It's only for the person who is ready to take their rightful place as a successful horse racing punter and is willing to do whatever it takes to finally make it happen...
As soon as your order is confirmed (it happens instantly), you can start immediately as everything is delivered online.

YES Frank!
  • I understand that once I grab this opportunity my life may never be the same
  • I'm ready to get started with this and start making money now
  • I fully understand that for the crazy low price of $197 I'm getting everything I need to gain financial freedom forever


Frank, I understand that this is a completely no risk deal as I'll be completely covered by the legally-binding, no-questions-asked guarantee.
I'm aware that this package gives me everything I need to make monster profits at horse racing betting and improve my life for good.



Get Instant Access NOW!
Instant Access Even If It's 2:00am!!

To your horse racing success,
Frank Belanger
WorldHorseRacingFormula.com
P.S.- If you're serious about making fast money betting on horse, you need The World Horse Racing Formula. I don't know of another way for you to get almost instant profit... other systems will see you waiting weeks or even months to make a profit.

P.P.S.-You really do have 2 futures from now. You've read about all the guys making crazy money at horse betting right? Well, the big guys got where they are by taking action at moments like this. You've got a decision to make, and the right one will change your life...
P.P.P.S.- Look, I'll level with you now. The horse racing betting lifestyle, isn't for everyone. Some people were just built to work hard for a living. That's why you're protected with my 2 month guarantee. If you don't like it, let me know, and I'll refund every red cent, no questions...

© Copyright 2010 The World Horse Racing Formula. All Rights reserved.


'ClickBank is a registered trademark of Keynetics Inc., a Delaware corporation. Worldhorseracingformula.com is not affiliated with Keynetics Inc. in any way, nor does Keynetics Inc. sponsor or approve any Worldhorseracingformula.com product. Keynetics Inc. expresses no opinion as to the correctness of any of the statements made by Worldhorseracingformula.com in the materials on this Webpage.
'

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Overview of BET Theory

The BET theory was developed by Stephen Brunauer (Figure (PageIndex{1}) ), Paul Emmett (Figure (PageIndex{2}) ), and Edward Teller (Figure (PageIndex{3}) ) in 1938. The first letter of each publisher’s surname was taken to name this theory. The BET theory was an extension of the Langmuir theory, developed by Irving Langmuir (Figure (PageIndex{4}) ) in 1916.

The Langmuir theory relates the monolayer adsorption of gas molecules (Figure (PageIndex{5}) ), also called adsorbates, onto a solid surface to the gas pressure of a medium above the solid surface at a fixed temperature to ref{1} , where θ is the fractional cover of the surface, P is the gas pressure and α is a constant.

[ Theta = frac{alpha cdot P}{1 + (alpha cdot P)} label{1} ]

The Langmuir theory is based on the following assumptions:

  • All surface sites have the same adsorption energy for the adsorbate, which is usually argon, krypton or nitrogen gas. The surface site is defined as the area on the sample where one molecule can adsorb onto.
  • Adsorption of the solvent at one site occurs independently of adsorption at neighboring sites.
  • Activity of adsorbate is directly proportional to its concentration.
  • Adsorbates form a monolayer.
  • Each active site can be occupied only by one particle.

The Langmuir theory has a few flaws that are addressed by the BET theory. The BET theory extends the Langmuir theory to multilayer adsorption (Figure (PageIndex{1}) ) with three additional assumptions:

  • Gas molecules will physically adsorb on a solid in layers infinitely.
  • The different adsorption layers do not interact.
  • The theory can be applied to each layer.

How does BET Work?

Adsorption is defined as the adhesion of atoms or molecules of gas to a surface. It should be noted that adsorption is not confused with absorption, in which a fluid permeates a liquid or solid. The amount of gas adsorbed depends on the exposed surface are but also on the temperature, gas pressure and strength of interaction between the gas and solid. In BET surface area analysis, nitrogen is usually used because of its availability in high purity and its strong interaction with most solids. Because the interaction between gaseous and solid phases is usually weak, the surface is cooled using liquid N2 to obtain detectable amounts of adsorption. Known amounts of nitrogen gas are then released stepwise into the sample cell. Relative pressures less than atmospheric pressure is achieved by creating conditions of partial vacuum. After the saturation pressure, no more adsorption occurs regardless of any further increase in pressure. Highly precise and accurate pressure transducers monitor the pressure changes due to the adsorption process. After the adsorption layers are formed, the sample is removed from the nitrogen atmosphere and heated to cause the adsorbed nitrogen to be released from the material and quantified. The data collected is displayed in the form of a BET isotherm, which plots the amount of gas adsorbed as a function of the relative pressure. There are five types of adsorption isotherms possible.

Bet Formula
Type I Isotherm

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Type I is a pseudo-Langmuir isotherm because it depicts monolayer adsorption (Figure (PageIndex{6}) ). A type I isotherm is obtained when P/Po < 1 and c > 1 in the BET equation, where P/Po is the partial pressure value and c is the BET constant, which is related to the adsorption energy of the first monolayer and varies from solid to solid. The characterization of microporous materials, those with pore diameters less than 2 nm, gives this type of isotherm.

Type II Isotherm

A type II isotherm (Figure (PageIndex{7}) ) is very different than the Langmuir model. The flatter region in the middle represents the formation of a monolayer. A type II isotherm is obtained when c > 1 in the BET equation. This is the most common isotherm obtained when using the BET technique. At very low pressures, the micropores fill with nitrogen gas. At the knee, monolayer formation is beginning and multilayer formation occurs at medium pressure. At the higher pressures, capillary condensation occurs.

Type III Isotherm

A type III isotherm (Figure (PageIndex{8}) ) is obtained when the c < 1 and shows the formation of a multilayer. Because there is no asymptote in the curve, no monolayer is formed and BET is not applicable.

Type IV Isotherm

Type IV isotherms (Figure (PageIndex{9}) ) occur when capillary condensation occurs. Gases condense in the tiny capillary pores of the solid at pressures below the saturation pressure of the gas. At the lower pressure regions, it shows the formation of a monolayer followed by a formation of multilayers. BET surface area characterization of mesoporous materials, which are materials with pore diameters between 2 - 50 nm, gives this type of isotherm.

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Type V Isotherm

Type V isotherms (Figure (PageIndex{10}) ) are very similar to type IV isotherms and are not applicable to BET.