Thermal properties

Water also has some physical properties relating to heat that add to its usefulness as a biological solvent.
Heat Capacity
For one thing, it has an unusually high specific heat, or heat capacity. Heat capacity, you should remember, is the amount of heat or the number of calories required to raise the temperature of one gram of that substance by one degree Celsius. Water's high heat capacity means that is can absorb or lose a relatively large amount of heat without undergoing a large change in temperature. Since many biological functions will not take place outside a narrow range of temperatures, water's ability to absorb and lose heat without a large temperature change provides an organism with a protection against the ill effects of a large external temperature change. Another way to say this is that large amount of water in our bodies stabilizes the temperature of our bodies.

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