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enthalpy, the sum of the interior energy and the product the the pressure and also volume the a thermodynamic system. Enthalpy is an energy-like residential property or state function—it has actually the dimensions of power (and is therefore measured in units of joules or ergs), and its worth is identified entirely by the temperature, pressure, and also composition of the system and also not through its history. In symbols, the enthalpy, H, equals the amount of the internal energy, E, and also the product that the pressure, P, and volume, V, of the system: H = E + PV.

According come the law of power conservation, the adjust in internal power is same to the warm transferred to, much less the occupational done by, the system. If the only work-related done is a readjust of volume at constant pressure, the enthalpy adjust is exactly equal come the warm transferred to the system. When energy needs come be included to a product to change its phase from a fluid to a gas, that amount of energy is referred to as the enthalpy (or implicitly heat) that vaporization and is expressed in units of joules per mole. Various other phase transitions have similar associated enthalpy changes, such together the enthalpy (or latent heat) of combination for changes from a solid to a liquid. Similar to other power functions, that is neither practically nor crucial to identify absolute values of enthalpy. For each substance, the zero-enthalpy state can be some convenient recommendation state.


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thermodynamics: Enthalpy and the warmth of reaction
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