Amazingly, when propane is brought into a liquid form, it will only weigh half the weight of water.
How much does a gallon of propane weigh?
One U.S. gallon of propane weighs 4.23 pounds (1.91 kg)
How Much Does A Gallon Of Propane Cost?
Just like with anything, supply and demand will determine what is to be charged for a gallon of propane.
In addition, your location and the season of the year are things that can also determine how much you will pay for a gallon of propane.
Currently, the average price of a gallon of propane is $2.36.
~ Fun Fact ~
Interestingly, propane is an odorless gas that has an odor attached to it only when a leak is being sought.