Basic Properties of Gas

I want to take a look at four of the basic properties of gases and I want to talk about the properties of gases in the context of a balloon, so that it gives us something to visualize when we’re talking about these properties.

Think of a balloon, as you blow air into this balloon your adding molecules to the air. As more of this air gets added to the balloon the volume is going to increase, which makes sense. Everyone knows when you blow air into a balloon the balloon expands and if you let air out of the balloon, then the balloon gets smaller.

Volume is proportional to the amount of gas. Now for this to be true, the temperature and the pressure has to be constant and you may be wondering, why is that? Well, you will see that temperature affects the volume and the pressure affects the volume. If the temperature and pressure changes and they’re also affecting the volume in the addition to the amount of gas and we can no longer really see what’s really affecting the volume, so volume is still no longer proportional to the amount of gas.

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