(Chemical Engineering: Distillation) The bubble point temperature is the temperature at which vapor first forms from a liquid.
This quantity is widely used in designing large industrial distillation processes. Relative volatility is a measure comparing the vapor pressures of the components in a liquid mixture of chemicals. These nomograms have two vertical coordinates, one for pressure, and another for temperature.
DePriester Charts provide an efficient method to find the vapor-liquid equilibrium ratios for different substances at different conditions of pressure and temperature.