All matter has energy. In molecules and atoms, this energy takes the form of motion. The amount of motion, or speed, is what kinetic energy, and it depends on the amount of speed. We call that rotation and linear motion energy Kinetic Energy.
When molecules hit foreign objects, they can transfer this energy to the matter in the object. We record this in themometers, so temperature is really a measure of the average KE of the particles.
What is the relationship between the temperature, speed, and kinetic energy of gas molecules
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http://www.psinvention.com/kinetic.htm
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