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The definition of energy. An easy to understand energy definition. Energy is the ability to make something happen. Science and technology education from FT Exploring.
Radiation is a form of energy transport consisting of electromagnetic waves traveling at the speed of light. Temperature is a measure of the average heat or thermal energy of the molecules in a substance. The atoms and molecules in a substance do not always travel at the same speed. This means that there is a range of energy (the energy of motion) among the molecules. In a gas, for example, the molecules are traveling in random directions at a variety of speeds - some are fast and some are slow. Sometimes these molecules collide with each other.