We use **phase** to express the state of a matter. For example, there are:

**Gas phase****Liquid phase****Solid phase**

In this topic, we are going to discuss more on **Gas Phase**.

Some physical properties of gases:

They occupy far more space than the liquids or solids.

They are easy to compress and expand.

They exert pressure.

From these properties, we can know that the studies of gases are much related on:

**Volume**(They occupy spaces)**Temperature**(They compress and expand easily when is cooled or heated)**Pressure**(They exert pressure)

This is true for the following gas law and we shall discuss these in my future post, which is:

**Boyle's Law****Charles' Law****Graham's Law of Diffusion****Gay-Lusaac's Law****Ideal Gas Law**

Some more notes:

Gases occupy space by

**diffusion**.**Brownian Motion**is a phenomena whereby small particles suspended in a liquid tend to move in random paths through the liquid, even if the liquid is calm. This can explain why gases exert pressure.\(\text{STP}\) refers to Standard Temperature and Pressure, which is \(273K\)(or \(0^\circ C\)) and \(1\text{ Bar}\)(or \(100000\text{Pa}\)) .

In \(\text{STP}\), \(1\text{ mol}\) of gases(any gases!) occupy a volume of \(22.4L\).

EDIT: Thanks to Anish Puthuraya for some informations on the \(\text{STP}\).

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## Comments

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TopNewestI have noticed that my previous note did not cover these so I add it on this introductory post.

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I just want to notify that, the Standard Pressure is

not1 atm anymore.It is

1 Bar, which is exactly \(10^5Pa\)But, that's just a minor detail.

Anyway, looking forward to your next posts.

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Do we also changed the value of 22.4L? This is because when I use 1 bar on my calculations, 1 mol gas will occupy a volume of 22.7L.

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So, even though this is incorrect, I think it would be better to stick with 1 atm, and 22.4L because most of the problems that are presented in this topic, assume it to be true.

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Wow, thanks for telling me that!

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I am waiting for your posts on the gas laws and Brownian motion and lots of your amazing problems.

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I'll try my best!

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The chemistry guys youre doing an awesome job....even though I specialize in math and computer science I studied chemistry at high school...its a nice refresher,..,,

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There are five states of matter, by the way. Anyway nice post,Christopher.

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Yes, Plasma and Bose-Einstein Condensate are the last two. But, the discussion is about gases, so considering the phase changes that gases go through, I think these 3 are enough.

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Yeah well, when it comes down to quantum mechanics, there are even more... than that. Like a truck load of states. X'D For now, I think following the "KISS" principle is preferred. ^^

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What is that principle?

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Where are the other three laws?

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What does "mol" means?

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A "mol" is nothing but a unit for measuring the number of something. Its value is : \(6.022\times 10^{23}\)

So, \(1 mol\) of a substance means that there are \(6.022\times 10^{23}\) molecules/atoms of the substance present

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Thanks

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Nice and simple, very nice. I like it.

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