hydrogen（H2）teeth、An element with atomic number 1、It is the lightest gas on earth。colorless and odorless、融点teeth-259℃、沸点teeth-253℃です。Although flammable、他の可燃性ガスとteeth異なり、炎teeth無色透明です。 hydrogenteeth、It can be obtained from the electrolysis of water and the decomposition of fossil fuels such as oil and natural gas.。地球上にteeth水や有機物などに化合物の状態でたくさん存在しますが、直接エネルギーとして使用できるhydrogen単体teeth、almost non-existent。 hydrogenteeth、Even when burned, only water is produced、It is said to have a low environmental impact。Also、hydrogenteeth二酸化炭素（CO2）To return to the water without emitting any、It is attracting attention as the ultimate clean energy.

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