Heat and Temperature
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The Sun warming the Earth is an example of radiation. In this process, the Sun's energy (heat) is transferred through space.
NASA
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Everything in the world is made up of millions of tiny parts called atoms. Atoms group together to make molecules. Each molecule vibrates, or moves quickly. Energy causes this vibration. Everything in the world has energy, from a running animal to a burning stove to an ice cube.
One type of energy is called heat energy. The faster the molecules move, the more heat they have. Scientists measure how hot things are by using temperature. Temperature is a number stated in degrees. Things that are hot, such as fire, have a lot of heat and a high temperature. Things that are cold, such as ice cubes, do not have much heat and therefore have a low temperature. Temperature is measured using a thermometer.
