Task: Text Categorization
Input (English): This quantity is plotted on the y axis against entropy in a Mollier diagram. The heat capacity at constant pressure is given by the derivative of this quantity with respect to temperature, and this quantity appears in the numerator divided by RT across from the derivative of the log of pressure with respect to temperature in the Clausius-Clapeyron equation. Joule-Thomson cooling occurs at a constant value of this quantity, which can be written as the derivative of the log of the partition function with respect to the inverse temperature. For ten points, identify this quantity which is used to calculate heat transfer, often across phases, and is defined as the internal energy plus the product of pressure and volume.
Output (English): Science