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There is a model for how gases exert pressure. Basically, think of gas molecules as small balls, and these small balls are flying around a container always travelling straight until they hit another gas molecule or the side of the container and then they change direction. The force from millions of gas molecules hitting the sides of the container puts a force on the container that can be measured, and we call this force pressure. It is the amount of force per unit of area, so the more gas molecules there are, the more collisions with the side of the container, the more force against the side of the container, and so the more pressure.
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its becuz the gas molecukes are always farther apart and want to be tat way..... bt we apply force.
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