Lesson 9, Topic 1
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# Introduction – Heat Energy

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When cold water is placed inside a pot and placed on a stove, the heat supply by the stove heats the water. The water becomes hot after some time as a result of heat energy absorbed from the stove.

When we dip our hands inside cold and hot water, our reactions to the two are not the same. The changes in the temperature of the water are a result of the heat energy supplied. Therefore, heat is a form of energy and temperature is the degree of hotness or coldness of a body.

A hot body is at a higher temperature than a colder body.

### Heat:

Heat is a measure of the total kinetic energy of a body and it is a scalar quantity measured in Joules. A calorimeter is used to measure the quantity of heat in a body.

### Temperature:

Temperature is the degree of hotness or coldness of a body. It is the property of a body that determines the direction of the flow of heat and it is a measure of the average kinetic energy of the molecules of a body. The instrument used for measuring the temperature of a body is called a thermometer, it is a vector quantity and the S.I unit is Kelvin (K).

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