The **thermal velocity** or **thermal speed** is a typical velocity of the thermal motion of particles which make up a gas, liquid, etc. Thus, indirectly, thermal velocity is a measure of temperature. Technically speaking it is a measure of the width of the peak in the Maxwell-Boltzmann particle velocity distribution. Note that in the strictest sense *thermal velocity* is not a velocity, since *velocity* usually describes a vector rather than simply a scalar speed.

Since the thermal velocity is only a "typical" velocity, a number of different definitions can be and are used.

Taking to be the Boltzmann constant, is the temperature, and is the mass of a particle, then we can write the different thermal velocities:

Read more about Thermal Velocity: In One Dimension, In Three Dimensions

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