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Gas Pressure

The study of gases takes a certain amount of imagination; after all, you usually can't see or feel a gas.

It turns out that you do feel gases but you are so accustomed to feeling them that you are not so conscious of it. For example, you inflate a balloon. Clearly, the inflated balloon feels very different from the deflated balloon. This difference is a direct result of internal gas pressure, or the gas pressure within the balloon.