Vapor pressure vs. temperature.
The vapor pressure of propane (C3H8) depends on the temperature. Vapor pressure of 100% propane:
Note! The metric chart indicates gauge pressure. The Imperial chart indicates absolute pressure. Imperial gauge pressure can be calculated as
psig = psia - 14.7 (psi)
See also other properties of Propane at varying temperature and pressure: Density and specific weight, Dynamic and Kinematic Viscosity, Prandtl number, Specific heat (heat capacity), Thermal conductivity and Thermal diffusivity, and Thermophysical properties at standard conditions.