I have a question about deriving the equation of kinetic theory of ideal gas - PV=1/3 Nmc(adsbygoogle = window.adsbygoogle || []).push({}); _{r}^{2}, where N is number of atoms, c_{r}is root mean square of atom speed and m is mass of one atom.

In deriving the equation, many text books consider the total rate of change of momentum within a certain time and calculate the pressure. However, in actual case the atoms collide on the wall of container separately atdifferent positionatdifferent time, how can these changes of momentum be considered as a whole?

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# Question about kinetic theory

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