Here's why:
* Temperature is a measure of heat energy. Heat energy is the total kinetic energy of the particles within a substance.
* Kinetic energy is the energy of motion. The faster the particles move, the more kinetic energy they have.
* Random motion: The particles in matter are constantly moving in random directions, colliding with each other.
Therefore, temperature reflects the average kinetic energy of these randomly moving particles.
Important Note: Temperature is a measure of the *average* energy. While some particles may have higher or lower energy than the average, temperature gives us a good overall picture of the energy of the particles in a substance.
