Large number of small particles all in rapid motion
Kinetic Molecular Theory

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What are the properties of Gases? 
(5)
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Can fill any container
Can undergo Diffusion and Effusion
Can be compressed
Have low densities
Are fluids

Movement of particles flowing through hole until the molecules reach equilibrium
Diffusion

According the KM model which moves the slowest in which phase?
Solids

Why do high altitudes have less pressure?
It is further away from earth and pressure lessens from further away

A common device used to measure atmospheric pressure is a....
Barometer