12. Heat, Energy, and Chemical        Bonds   Previous PageNext Page
       Heat and Chemical Reactions

To bring such a giant number into comprehensible range, a person not doing heavy labor normally needs the equivalent of 2000 kcal of energy from food per day. The energy removed annually by evaporation from every square kilometer of tropical ocean would correspond to enough energy to keep 2 million people going for a year.

Notice that we can add two of the previous reactions to yield the third:

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