Here's why:
* Molecular Motion: Molecules are constantly in motion, vibrating, rotating, and translating (moving from place to place).
* Temperature and Kinetic Energy: Temperature is a direct measure of the average kinetic energy of these molecules. Kinetic energy is the energy of motion. The higher the temperature, the faster the molecules are moving, and the higher their average kinetic energy.
* States of Matter: Temperature influences the state of matter. At low temperatures, molecules have less kinetic energy and are closer together (solids). At higher temperatures, they have more energy and are more spread out (liquids and gases).
So, while temperature is often measured in units like Celsius or Fahrenheit, it fundamentally represents the average motion of molecules within a substance.
