Question

explain briefly the Newton's law of cooling, give 3 examples about this law and add one picture with each example

Answer 1

Newton's law of cooling states that the rate of cooling of an object is directly proportional to the difference in temperature between the object and its surrounding.

This can be expressed mathematically as:

`\begin{gathered} Q=h_cA\triangle T \\ \\ where: \\ Q\text{ = rate of heat transfer} \\ A\text{ is the area of the surface} \\ h_c\text{ is the convection coefficient} \\ \triangle T\text{ is the change in temperature} \end{gathered}`

Three examples in which Newton's law of cooling is applied:

• Melting of Ice-cream

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• Cooling of heated water

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• Forensic science

A picture to illustrate the melting of ice cream:

A picture to illustrate the cooling of heated water