Q.

Water is used in a hot water bag because –

A. It is easily available
B. It has high specific gravity
C. It has high specific heat
D. It is a liquid substance
Answer» C. It has high specific heat
Explanation: Water has the highest specific heat of any known substance except hydrogen; that is, it requires more heat to raise the temperature of water a definite number of degrees than it does to raise the temperature of an equal amount of any other substance the same number of degrees.
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