Creating air headspace

All OLI Calculations are closed systems. This means that an air environment, or any environment, is never considered unless explicitly created. Below are two images.

The first image is a 10% methanol in water System open to the Air Environment. The 10% methanol can evaporate and condense. Its mass balance is therefore not conserved. Energy can also transfer to and from the environment. The air mass assumed to be infinite relative to the liquid mass.

The second image is 10% methanol closed to the environment. Mass cannot leave or enter the system. it is therefore conserved. Heat transfer is allowed.

ALL OLI CALCULATIONS ARE CLOSED SYSTEMS