Chemistry / Chem 0630 · Atom · ~20 seconds
Thermal Energy and Temperature
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Thermal energy is the kinetic energy of randomly moving atoms and molecules; temperature measures how hot that motion makes a sample.
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Molecules in hot water move faster on average than molecules in cold water, so the hot sample reads a higher temperature.
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Temperature measures motion per particle, never the total thermal energy in a sample, regardless of that sample's size.