Water is used in a hot water bag because

Options

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

Explanation

Water has the highest specific heat of any known substance except hydrogen: that is, it requires more heat to raise the temparature of water a definite number of degree than it does to raise the temparature of an equal amount of any other substance the same number of degrees. Practically this same thing can be stated in another way : Water in cooling gives out more heat than any other substance in cooling through the same number of degrees. For this reason water is used in Foot warmers and in hot-water bags (General Science by Bertha Clark).