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Temperature is a measure of how hot or cold something is; specifically, it's a measure of the average kinetic energy per molecule in an object or system.
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Kelvin Scale: A thermodynamic temperature scale where absolute zero, the lowest possible temperature, is zero Kelvin.
The process by which thermal energy moves from one thing to another thing due to their difference in temperatures.
The branch of physics that deals with heat and its relation to other forms of energy and work.