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| 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 | |
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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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