Temperature has no effect on the weight of a gallon of propane gas. Neither an increase nor a decrease in temperature results to a change in the quantity of propane gas.
Propane is closely associated to petroleum and natural gas, which are types of fossil fuels created from the petrified remains of prehistoric organisms. It is a colorless, odorless compound with the chemical formula C3H8. Propane is the primary component in liquefied petroleum gas, or LPG, that is widely used in the United States.
Propane normally exists in nature as a gas. However, it can be converted into its liquid form when subjected to increased pressures or reduced temperatures. Due to its high compressibility, propane gas is commonly stored in LPG containers in its liquefied form, which turns back into propane gas during usage.
The volume of liquefied propane gas inside a tank is directly correlated to temperature. Volume increases along with temperature, where a decrease in temperature causes propane to undergo compression due to an increase in density. Temperature readings are usually indicated by a floating gauge, calibrated to the standard temperature of 60 degrees Fahrenheit. When a significant decrease in temperature occurs, the reading shows there is less propane inside the container. However, this only pertains to the volume and not the weight of the fuel. For instance, 1 gallon of liquefied propane gas still remains in the tank even if the reading indicates a higher or lower volume caused by a change in temperature.