The measure of the average amount of motion in particles of matter is called temperature.

Here's why:

* Temperature is a measure of the average kinetic energy of the particles within a substance.

* Kinetic energy is the energy of motion.

* The faster the particles move, the higher their kinetic energy and the higher the temperature of the substance.

So, temperature is essentially a way to quantify how much the particles in a substance are jiggling around.