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At constant T, pressure and volume of a fixed gas mass are inversely proportional.
At constant P, volume of a fixed gas mass varies linearly with absolute temperature.
PV = nRT unifies P, V, T for an ideal gas.
Gas pressure arises from molecular collisions with the container walls.
Temperature is a direct measure of average molecular kinetic energy.
Three characteristic molecular speeds summarise the gas distribution.
Average distance a molecule travels between collisions.