What is called thermal motion? What is the name of the physical quantity that characterizes the degree of heating

What is called thermal motion? What is the name of the physical quantity that characterizes the degree of heating of bodies, and with what device is it measured? How does the average kinetic energy of molecules of a body change with an increase in its temperature?

Disordered particle movement
Temperature ; thermometer
With an increase in temperature, the average kinetic energy of body molecules increases, with a decrease, it decreases.



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