Energy is usually defined as the capacity to do the work.
For example, the energy contained in tidal waves, can be harness to perform work.

tidal

Thermochemistry is part of a broader subject called thermodynamics, which is the scientific study of the interconversion of heat and other kinds of energy. The laws of thermodynamics provide useful guidelines for understanding the energetics and directions of processes. In this section we will concentrate on the first law of thermodynamics, which is particularly relevant to the study of thermochemistry.0102first_law03fg08_02 04 05 06 07

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