# c9 - Gas Laws Origin of Pressure: Pressure is a measure of...

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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 container wall is shorter and more collisions occur. Why aren’t liquids and solids compressible? There is little if any space between the molecules.
All the early experiments were done using air a rather complex mixture of gases. The ideal gas law holds for this kind of

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## This note was uploaded on 02/10/2011 for the course CHM 2046 taught by Professor Veige/martin during the Spring '07 term at University of Florida.

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c9 - Gas Laws Origin of Pressure: Pressure is a measure of...

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