Dynamic Theory
a hypothesis broached by Kant that all matter originated from the action of two mutually antagonistic forces-attraction and repulsion. All the predicates of these two forces are attributed by Kant to motion.
As applied to heat, it is a theory or hypothesis that now is generally accepted as the correct one-which represents a heated body as being simply a body the particles of which are in a state of vibration. This vibratory movement increases as the body is still more heated, and diminishes proportionately as it more or less rapidly cools. It is called also the mechanical theory of heat.