Eli5 – would it take more time/energy to boil a pint of frozen water or freeze a pint of boiling water?
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Assuming the freezing temperature was the same, the amount of time would be the same. What I mean by assuming the freezing temperatures are the same is if we start with 100g of water at 0F, and heat it to 212F and compare it to another 100g of water that is 212F and cool it down to 0F, both would take the same time and energy.
There is a concept called heat of fusion, which says how much energy is needed to move from solid to a liquid, and it is equal and opposite to the heat of solidification, which is the amount of energy to go from liquid to a solid.
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