Answer:
temperature
Explanation:
When temperature is constant, the enthalpy change of a process equal to the amount of heat transferred into or out of the system.
When pressure is constant, the enthalpy change of a process equal to the amount of heat transferred into or out of the system
Enthalpy, the sum of the internal energy and the product of the pressure and volume of a thermodynamic system. Enthalpy is an energy-like property or state function—it has the dimensions of energy (and is thus measured in units of joules or ergs),
and its value is determined entirely by the temperature, pressure, and composition of the system and not by its history. In symbols, the enthalpy, H, equals the sum of the internal energy, E, and the product of the pressure, P, and volume, V, of the system: H = E + PV.
According to the law of energy conservation, the change in internal energy is equal to the heat transferred to, less the work done by, the system.
If the only work done is a change of volume at constant pressure, the enthalpy change is exactly equal to the heat transferred to the system
Hence when pressure is constant, the enthalpy change of a process equal to the amount of heat transferred into or out of the system
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