Question

Define newtons law of cooling

Answer 1

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Newton's law of cooling states that the rate of heatloss of a body is directly proportional to the difference in the temperatures between the body and its surroundings provided the temperature difference is small and the nature of radiating surface remains same. As such, it is equivalent to a statement that the heat transfer coefficient, which mediates between heat losses and temperature differences, is a constant. This condition is generally true in thermal conduction (where it is guaranteed by Fourier's law), but it is often only approximately true in conditions of convective heat transfer, where a number of physical processes make effective heat transfer coefficients somewhat dependent on temperature differences. Finally, in the case of heat transfer by thermal radiation, Newton's law of cooling is not true.

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Answer 2

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Newton's law of cooling:-

Named after the famous English Physicist, Sir Isaac Newton, Newton's Law of Cooling states that the rate of heat lost by a body is directly proportional to the temperature difference between the body and its surrounding areas. ... Newton's Law of Cooling leads to the often cited equation of exponential decline over time.