Describe briefly an experiment to verify Newton’s law of cooling. 

Describe briefly an experiment to verify Newton’s law of cooling.

Hot water in a calorimeter is placed near an open window. The temperature of the water is recorded at suitable time intervals. A graph of temperature against time is plotted. Slope of the graph is obtained at temperature θ₁. More values of the slope are obtained at different temperatures, θ₂, θ₃, θ₄ ………………

For each temperature, excess temperature, (θ -θ_R) is calculated, where θ_R is the room temperature.

A graph of slopes against excess temperature is plotted.

A straight line graph through the origin verifies Newton’s law.

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