Newton's law of cooling states, "For a body cooling in a draft (i.e., by forced convection), the rate of heat loss is proportional to the difference in temperatures between the body and its surroundings." Since the temperature change is proportional to the heat change
where m is the mass of the body and is its heat capacity, we can write
where is the derivative Eric Weisstein's World of Math of temperature with respect to time t, is the temperature of the surroundings, and K is an experimental constant.
