Which one among the following is true in the context of enthalpy (H), internal energy (U), pressure (P) and volume (V) of a thermodynamic system?

The correct answer is H = U + PV.

Key Points

• Enthalpy, a property of a thermodynamic system, is the sum of the system's internal energy and the product of its pressure and volume.
• It is a state function used in many measurements in chemical, biological, and physical systems at a constant pressure, which is conveniently provided by the large ambient atmosphere.
• The heat absorbed or released during a process at constant pressure is equal to the change in enthalpy. 
• Enthalpy can be written as H = U + PV
• Where, H = Enthalpy of the system
• U = Internal energy of the system
• P = Pressure of the system
• V = Volume of the system
• SI Unit of Enthalpy: Joule

Therefore, the correct answer is H = U + PV.