Heat and temperature

  • Heat is a form of energy. Heat transfer takes place from hotter body to colder body.
  • Heat transfer takes place until both the bodies attain same temperature. This condition is called thermal equilibrium condition.
  • Heat energy changes the dimensions of object, changes the temperature of object and shape of the object.
  • Heat is measured in joules.
  • Temperature is the measure of degree of hotness or coldness of body. Temperature determines the direction of heat. Temperature tells the physical state of the body.
  • Temperature is measured in kelvin, degree Celsius and Fahrenheit. Temperature of a body is measured with the help of thermometers.
  • Different types of thermometers which measure the temperature in different units are Celsius scale thermometer, Fahrenheit scale and Kelvin scale thermometers. The relation between these scales is 32oF is equal to 0oC which also equals to 273 K.

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  • Q1

    How can we measure the temperature of our body?

    Marks:1
    Answer:

    Temperature of our body can be measured by the help of clinical thermometer.

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  • Q2

    What do you understand by the term Temperature?

    Marks:1
    Answer:

    Temperature is a quantity which defines the thermal state of a body. It is the degree of hotness or coldness of the body.

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  • Q3

    Give the SI and CGS unit of heat.

    Marks:1
    Answer:

    The SI unit of heat is joule and the CGS unit of heat is erg.

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  • Q4

    State the factors on which the amount of heat contained in the body depends.

    Marks:2
    Answer:

    The amount of heat contained in the body depends on
    · Mass of the body
    · Material of the body
    · Temperature of the body

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  • Q5

    How is heat different from temperature? Justify your answer with an example.

    Marks:2
    Answer:

    Heat is a form of energy that produces a change in the temperature of a body depending on whether it is absorbed or released heat. For example, if water is heated on a flame, its temperature rises, whereas if the water is cooled (i.e., it loses heat energy), its temperature falls.

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