The idea that matter is made up of small particles that are in constant motion is
a. bernoulli’s principle
b. heat of fusion
c. charles’s law
d. the kinetic theory of matter

The kinetic theory of matter

Explanation:

The kinetic theory of matter states that the atoms of every matter are in continuous constant motion. forms of matter can be grouped solid, liquid or gas. The molecules of a solid vibrate about their mean position. The molecules of liquid vibrate and can flow and they also take the shape of their container. The molecules of a gas  are in constant random motion and collide with each other and with the walls of their containing vessel.