During an adiabatic saturation process, the quantity that remains constant is the total heat content, also known as the enthalpy (H) of the system.
An adiabatic process is one in which there is no heat exchange between the system and its surroundings. In the case of adiabatic saturation, it refers to the process of saturating a gas or vapor mixture with moisture without any heat transfer occurring.
During adiabatic saturation, the system's temperature and pressure may change, but the total heat content remains constant. This means that the enthalpy (H) of the system before and after the adiabatic saturation process will be the same.
The equation representing this constant enthalpy change during adiabatic saturation is:
H₁ = H₂
Where: H₁ = Initial enthalpy of the system before adiabatic saturation H₂ = Final enthalpy of the system after adiabatic saturation
It's important to note that while the total heat content (enthalpy) remains constant, other properties such as temperature and pressure can change during an adiabatic saturation process.