CH 12 GAS LAWS - Gas Laws Origin of Pressure Pressure is a...

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Gas Laws Origin of Pressure : Pressure is a measure of the force a gas exerts on a surface. How do individual gas particles create this force? When particles collide with a surface they exert a force, examples; rain drops, hailstones etc. F = m x a or KE = ½ mv 2 When particles collide with a container they exert a force on the walls. If the container is a balloon the walls can expand in response to the pressure. The more they collide the higher the pressure the larger the balloon. To increase the pressure increase the number of molecules (add more stuff, gas) or increase the number of collisions with the wall (increase the temperature or decrease the volume).
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Boyle’s Law : A change in gas pressure in one direction causes a change in gas volume in the other direction. What happens to the particles when external pressure compresses the gas volume? As the pressure increases at constant temperature, the distance between molecules decreases and the sample volume decreases. The pressure increases because the distance to the
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This note was uploaded on 05/31/2008 for the course CHM 2045 taught by Professor Mitchell during the Spring '07 term at University of Florida.

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CH 12 GAS LAWS - Gas Laws Origin of Pressure Pressure is a...

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