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Enthalpy of a reaction or energy change of a reaction D H, is the amount of energy or heat absorbed in a reaction. If the energy is required, D H is positive, and if energy is released, the D H, is negative.
The enthalpy of vaporization is the energy required to turn water into the gaseous form when it increases in volume by 1,700 times at standard temperature and pressure; this change in volume can be converted into mechanical work by steam engines such as reciprocating piston type engines and steam turbines, which are a sub-group of steam engines.