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a hotter substance cools faster. what could be the reason?
A hot substance will pass on heat to a substance at a cooler temperature. If it was surrounded by an even hotter substance it would be "given" heat. Heat can only flow from hotter to colder, just as water flows from higher to lower ground.
If the temperature difference between the substances is great, then heat will pass more quickly, but if the difference is very slight, then the flow of heat will be very much slower.


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