Question

state and explain Newton's law of cooling state the condition under which this law is applicable.A body cools from60°to 50°c in 5 minutes and to 40° c in another 8 minutes find the temperature of the surroundings​

Answer 1

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Statement :

The rate of cooling of a body is directly proportional to the difference in the temperature of the body and its surrounding.

Newton's law of cooling is applicable :

1) Loss of heat is negligible by conduction and only when it is due to convection.

2) Loss of heat occurs in a stream lined flow of air i.e., forced convection.

3) Temperature of the body is uniformly distributed over it.

4) Temperature differences are moderate i.e., upto 30 K, however if heat body is due to forced convection the law is valid for large differences of temperature also.

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