Newton's Law of Cooling
We will encounter this same exponential function in a w-i-d-e variety of seemingly unconnected situations.
Tsurf is the temperature of the surface of the object. Tsrnd is the temperature of the surroundings. T is the difference in temperature between the initial temperature of the object and its surroundings.
Here is an alternate solution to this same problem (altho' I think the previous solution is more straightforward):
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