Temperature tells how hot or cold something is by measuring the average motion of its particles. Higher temperature usually means particles are moving faster. Temperature is often measured in degrees Celsius or Kelvin.

Heat is thermal energy moving from a warmer object to a cooler one. Heat flows because of a temperature difference. A spoon in hot soup gets warm because heat moves from the soup to the spoon.

Light is a form of energy that travels in waves. It usually moves in straight lines until it hits an object. Light can be reflected, absorbed, or transmitted through materials.