Without a bit of physics as it gets, unfortunately ...
Just getting used to is the question of what there is for now in kg of natural gas for energy content in it? And this is in fact not uniform: A distinction between so-called "H" gas, so higher calorific gas Humminbird 597ci HD DI (H = high) and "L" gas, which is niederkaliorisch (L = low). While the former slightly more energy per unit, that has kWh or kg, the latter has about 10% less. Albeit with slight fluctuation, because the utilities in their sales areas, the two qualities can also mix well with each other and it is important for us comes from what (international) aid areas the gas. However, even in a coverage area of the energy content is the same as the gas heaters are different depending on the gas burner nozzles technical configurations, which depend on the application for the upcoming H-or L-gas.
H gas is better than L-gas!
For those interested, H-gas's has something more in himself: With around. 10.6 to 12.8 kWh per kWh is higher than the L-rd with gas. 9.3 to 10.5 kWh / kWh. About the specific gravity of natural gas is converted to kg:
Both have more energy content than gasoline and diesel!
The energy content of 1 kg of natural gas is between 11 and approx. 13 kWh, which is about up to 60% more than premium gasoline (about 8.6 kWh per liter), and even - that's diesel fraction is somewhat disappointing - up to 40% more than 1 liter of diesel (9.7 kWh / liter).