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It is called the root mean square of the velocity.

Temperature is a measurement of the kinetic energy of a system. It is expressed as

E=1/2mv2

where
E=energy
m=mass of the particles
v= the velocity of the particles.

Now it is understood that there will be a wide variance in the speed of all particles in the system but as we get only one temperature reading - that reading suggest a particular speed. This is where the word 'mean' comes from.

solving for v then gives

v=SQRT(2E/m)

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15y ago

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