Physics
(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 900 J kg-1 °C-1 , 380 J kg-1 °C-1 and 460 J kg-1 °C-1 respectively, which will you prefer for calorimeter? Given reason.
(d) How is the loss of heat due to radiation minimized in a calorimeter?
Calorimetry
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Answer
(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) It is made up of a thin sheet of copper. The reasons for using copper are:
- Copper is a good conductor of heat, so the vessel soon acquires the temperature of it's contents.
- Copper has the low specific heat capacity so the heat capacity of calorimeter is low and the amount of heat energy taken by the calorimeter from the contents to acquire it's temperature, is very small.
(c) Heat capacity of the calorimeter should be low. Hence, B should be preferred for making the calorimeter.
(d) The outer and inner surfaces of the vessel should be polished so as to reduce the loss of heat due to radiation in a calorimeter.
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