Question

The theory of matter states that all particles of matter are in constant motion.

Answer 1

Is that a question? Or are you asking if that statement is true?

Answer 2

Well... the motion of molecules are based on the temterature of the system. But what i like to point out is what we all know as the absolutr zero 0 K or -273,15°C. In the theory of thermodynamic, this is the state where no more heat can be removed from a system, this can be showed by useing the ideal gas law. In additon to that we also say in classical kinetic theory, that there is no movement of individual molecules at the absolute zero. Experimental evidences shows, nevertheless, other things.