1030-1060 BTU/cf 1 gal (US) = 0.133 cf (cubic foot) 1 cf = 7.48 gal converting units, 138 - 142 BTU/gal X 600 ( the approximate volume change from liquid to gas = 84,000 BTU/galhttp://www.retailenergy.com/hybrid/Liquified%20Natural%20Gas.htm The previous answer neglected to account for the difference in the BTU/vol of methane as a liquid vs the BTU/vol of methane as a gas
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One gallon of liquefied natural gas (LNG) contains approximately 126,000 BTU (British Thermal Units) of energy.
One gallon of liquefied natural gas (LNG) is equivalent to about 0.136 cubic feet.
Many powders and solids can be melted (liquefied) by heat. For instance, sugar and butter is often melted in cooking.
The energy content of a gallon of salt water would depend on the concentration of salt in the water. On average, seawater contains about 3.5% salt. Using this concentration, a gallon of salt water would contain very minimal energy in the form of trace amounts of potential thermal energy due to the dissolved salt. It would not be practical to extract energy from a gallon of salt water in this context.
1 CCF of natural gas is roughly equal to 1 gallon of propane.
It would seem that for many people, the fact that an energy source is "natural" is not the only criterion to select an energy source.