Question

2.State Newton's law of cooling. Explain
how it can be experimentally verified.​

Answer 1

Answer:

Newton's Law of Cooling states that the rate of change of the temperature of an object is proportional to the difference between its own temperature and the ambient temperature (i.e. the temperature of its surroundings).

Law of Cooling

With T (t) being the temperature of an object at a certain time

t being the time in seconds

Ts being the temperature of the surroundings

T0 being the starting temperature of the object

and k being the cooling constant.

Explanation:

Verification....

We can experimentally verify this law with a spherical calorimeter (a laboratory device that is used to measure the quantity of heat transferred to or from an object) filled with hot water. The calorimeter has mass m and specific heat capacity s and the hot water has mass m1 and specific heat capacity s1. Using the calorimeter we measure the amount of heat energy lost as the temperature of the water and calorimeter falls from temperature T0 to temperature T1 after a set time. As the temperature drops, the temperature is noted for every 30 seconds for a set time. Graphing the change of temperature versus the change in time gives us a cooling curve that we can use to calculate the rate of cooling.

After calculating the rate of the cooling curve, we find that the rate of cooling is proportional to the difference between the temperature of the object and the temperature of the surroundings, verifying Newton's Law of Cooling.

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