Task: Text Categorization
Input (English): This quantity is the intensive variable added to internal energy when calculating enthalpy. Fugacity gives a real-world representation of this quantity, which is divided by density in the incompressible equation of Bernoulli's Principle. It is directly proportional to temperature by Gay-Lussac's Law. Measured in pascals, it is, according to Boyle's Law, inversely proportional to volume. For 10 points, name this force per unit area whose atmospheric type is measured by a barometer.
Output (English): Science