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Gas molecules are loosely bound to one another. When they are excited by light rays or other molecules, they collide with each other and on the sides of the container. The equation for an ideal gas that has reached a stable condition is

PV = NRT,

where P is the pressure of the gas, V is the volume of the gas, N is the number of molecules, R is the gas constant, and T is the absolute temperature.

Therefore, the answer to your question is

P = NRT/V.

This is the pressure that is caused by the gas molecules impinging on the sides of the container. There are chemical tables that give the pressure per square inch for various gases at various temperatures, so you don't have to solve this equation for each situation.

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13y ago

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