Thermal energy is how much the molecules are moving inside an object. The faster molecules move, the more thermal energy it has.
Objects whose molecules are moving very quickly are said to have high thermal energy or high temperature. Like a cloud of steam, for example. The higher the temperature, the faster the molecules are moving.
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Remember that temperature is just a speedometer for molecules. The speed of the molecules in ice cream is way slower than it is in a hot shower.
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