What is the vapor pressure of propane in PSIG at 70°F?

The vapor pressure of propane at 70°F is approximately 127 PSIG. This value is based on the physical properties of propane, which can be found in various reference materials, including safety data sheets and engineering handbooks. At room temperature, propane exists primarily as a gas due to its relatively low boiling point; however, it can create significant vapor pressure in a closed system.

Understanding the vapor pressure is crucial for applications involving propane, especially in storage and handling, as it indicates the pressure exerted by the vapor when the liquid and vapor phases are in equilibrium. Knowing this pressure helps ensure safe and effective management of propane systems, such as tanks and cylinders, by informing users about the potential pressures that can be encountered during various temperatures.

High vapor pressures, such as those indicated in some of the incorrect options, would not occur at 70°F for propane, as they would exceed the typical readings for this temperature. Therefore, recognizing the 127 PSIG threshold helps in the safe application of propane systems while ensuring compliance with regulations and safety protocols.