Hydrogen is an odorless and colorless gas, due to its boiling point of -252.77o C. Its density of 0.0899 grams/liter make it lighter than the surrounding air and bestows the ability to rapidly dissipate if released into the atmosphere or spilled onto the ground. According to “Hydrogen in the Energy Sector” by Dr. Zittel; et al., when comparing energy density by weight, “hydrogen has the highest energy to weight ratio of all fuels. 1 kg of hydrogen contains the same amount of energy as 2.1 kg of natural gas or 2.8 kg of gasoline.” To clarify a point, hydrogen ranks last when
the comparing energy density by volume. Hydrogen possesses 2.36 kWh/liter as a liquid, natural gas contains 5.8 kWh/liter and gasoline registers at 8.76 kWh/liter. These facts are relevant to the analogy of the size of a hydrogen tank and the size of a comparable gasoline tank as well as the explosion hazard associated with the fuels.
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