Heat content, symbolized as H; a thermodynamic function, defined as E + PV, where E is the internal energy of a system, P the pressure, and V the volume; the heat of a reaction, measured at constant pressure, is ΔH. SYN: heat (4). [G. enthalpo, to warm in]
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en·thal·py 'en-.thal-pē, en-' n, pl -pies the sum of the internal energy of a body and the product of its volume multiplied by the pressure
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en·thal·py (enґthəl-pe) [en- + Gr. thalpein to warm] the heat content or chemical energy of a physical system; it is a thermodynamic function equal to the internal energy plus the product of the pressure and volume. Symbol H.Medical dictionary. 2011.