heat capacity or thermal capacity is defined as the amount of heat energy required to raise the temperature of a body by 10C. It is denoted by C’.

**Heat capacity or**** ****Thermal**** ****capacity**

Now, you are familiar
with specific heat capacity. It is the heat required to raise the temperature
of a unit mass of the body by 10C. But, heat capacity is the heat required to
raise the temperature of a entire mass of the body by 1˚C. Thus, heat capacity or
thermal capacity is defined as
the amount of heat energy required to raise the temperature of a body by 10C. It is denoted by C’.

Heat Capacity = Quantity
of heat required / Rise in temperature

C^{I} = Q/t

SI unit of heat capacity
is J/K. It is also expressed in cal/˚C, kcal/˚C or J/˚C.

As we saw earlier, if C
is the heat required to raise the temperature of unit mass of the body by 1˚C
then the heat required to raise the temperature of ‘m’ mass of the substance is
m C. So, heat capacity is also given as, C^{I} = m x C.

An iron ball requires
5000 J heat energy to raise its temperature by 20ºC. Calculate the heat
capacity of the iron ball.

Given, Q 5000 J, ΔT 20ºC
or 20 K

Heat Capacity C = Heat
energy required, Q / Rise in temperature, T

= 5000/20

= 250 JK^{-1}

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9th Science : Heat : Heat capacity or Thermal capacity |

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