4.2 lb per US gallon
5.1 lb per Imperial gallon
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If filled with 20 lbs, approx. 4.7 gals If you get it at an exchange, (see label) most only put 15 lbs. = 3.5 gals
20 percent of 100 pounds is 20 pounds. Therefore, if there is 20 percent left in a 100-pound propane tank, there are 20 pounds of propane remaining in the tank.
There are approximately 4.24 cubic feet in a 20 gallon propane tank.
Assuming the propane cylinder you mentioned is a standard 20 lb propane tank, it would hold around 4.7 gallons of water. This varies depending on the specific dimensions of the tank.
On average, one gallon of propane contains about 0.73 gallons of gasoline equivalent. This means that you would need around 1.37 gallons of propane to equate to 1 gallon of gasoline in terms of energy content.
A 20 lb tank can typically hold 4.7 gallons (18 liters) of liquid propane when filled to 80% capacity, as recommended for safety reasons.