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According to the Figure 1, the mass energy density (specific energy) of some substances is as follows: liquid hydrogen: 141.6MJ/kg, gasoline: 46.4MJ/kg, diesel: 44.8MJ/kg, lithium: 43MJ/kg, lithium-ion battery: 0.46-0.72MJ/kg. By comparison, it is evident that there is only a small difference in mass energy density among gasoline, diesel and ...
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