by Dalton's law (known since 1802), the partial pressure of water vapor or any substance does not depend on air at all, and the relevant temperature is that of the liquid. Nevertheless, the erroneous belief persists among the public and even meteorologists, aided by the misleading terms saturation pressure and supersaturation and the related definition of relative humidity. See also Absolute humidity Antoine equation Lee–Kesler method Osmotic coefficient Raoult's law: vapor pressure lowering in solution Reid vapor pressure Relative humidity Relative volatility Saturation vapor density Triple point True vapor pressure Vapor–liquid equilibrium Vapor pressures of the elements (data page) Vapour pressure of water References External links Fluid Characteristics Chart Hyperphysics MSDS Vapor Pressure Online vapor pressure calculation tool (Requires Registration) Prediction of Vapor Pressures of Pure Liquid Organic Compounds Thermodynamic properties Engineering thermodynamics Meteorological concepts Gases Pressure