A calorimeter is kept in a wooden box to insulate it thermally from the surroundings. Why is it necessary?
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A calorimeter is kept in a wooden box so that, no heat escapes from it due to convection.
It is necessary because only then will the calorimeter be able to measure the quantity of heat when a substance will be mixed with another one.
If the calorimeter isn't kept in a wooden box, then, heat will escape from it to the surroundings when substances are mixed and the right quantity of heat energy won't be measured.
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