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# NewtonŌĆÖs Law of Cooling Using Calorimeter

To study the relationship between the temperature of a hot body and time by plotting a cooling curve.

NEWTONŌĆÖS LAW OF COOLING USING CALORIMETER

## AIM

To study the relationship between the temperature of a hot body and time by plotting a cooling curve.

## APPARATUS REQUIRED

Copper calorimeter with stirrer, one holed rubber cork, thermometer, stop clock, heater / burner, water, clamp and stand

## NEWTONŌĆÖS LAW OF COOLING

NewtonŌĆÖs 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) where

dT/dt ŌåÆ Rate of change of temperature (┬░C)

T ŌåÆ Temperature of water (┬░C)

T0 ŌåÆ Room Temperature (┬░C)

## DIAGRAM ## PROCEDURE

┬Ę           Note the room temperature as (T0) using the thermometer.

┬Ę           Hot water about 90┬░C is poured into the calorimeter.

┬Ę           Close the calorimeter with one holed rubber cork

┬Ę           Insert the thermometer into calorimeter through the hole in rubber cork

┬Ę           Start the stop clock and observe the time for every one degree fall of temperature from 80┬░C

┬Ę           Take sufficient amount of reading, say closer to room temperature

┬Ę           The observations are tabulated

┬Ę           Draw a graph by taking time along the x axis and excess temperature along y axis.

## MODEL GRAPH ROOM TEMPERATURE (T0) = _______┬░C

## OBSERVATIONS

Measuring the change in temperature of water with time ## RESULT

The cooling curve is plotted and thus NewtonŌĆÖs law of cooling is verified.

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11th Physics : Practical Experiment : NewtonŌĆÖs Law of Cooling Using Calorimeter | Physics Laboratory Practical Experiment