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Question

(a) What is calorimeter?

(b) Name the material of which it is made of. Give two reasons for using the material stated by you.

(c) Out of the three metals A,B and C of specific heat capacity 900 J kg1 C1,380Jkg1 C1 and 460Jkg1 C1 respectively,which will you prefer for calorimeter? Give reason.

(d) How is the loss of heat due to radiation minimized in a calorimeter?


Solution

(a) A calorimeter is a cylindrical vessel which is used to measure the amount of heat gained (or lost) by a body when it is mixed with the other body.

(b) A calorimeter is made up of copper. This is because

  • Copper is a good conductor of heat, so the vessel soon acquires the temperature of its contents.
  • Copper has low specific heat capacity, so the amount of heat energy taken by the calorimeter from the contents to acquire its temperature is very small.

(c) Specific heat capacity defined as the total amount of heat required to raise the temperature of unit mass of a substance by 1°C. We shall select C whose specific heat capacity is 460 J/kg/°C to make a calorimeter because of its low specific heat capacity. For C, the heat required is less to increase the temperature of the calorimeter.

(d) Heat loss due to radiation is minimized by polishing the outer and inner surfaces of the vessel.

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