<P> The kinetic theory describes a gas as a large number of submicroscopic particles (atoms or molecules), all of which are in constant rapid motion that has randomness arising from their many collisions with each other and with the walls of the container . </P> <P> Kinetic theory explains macroscopic properties of gases, such as pressure, temperature, viscosity, thermal conductivity, and volume, by considering their molecular composition and motion . The theory posits that gas pressure is due to the impacts, on the walls of a container, of molecules or atoms moving at different velocities . </P> <P> Kinetic theory defines temperature in its own way, in contrast with the thermodynamic definition . </P>

When was the kinetic theory of matter discovered