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It is a commonplace that hydrogen is dangerous, explosive, expensive to use and difficult to transport.
On the contrary, however:
Hydrogen burns in air when its concentration is between 4 and 75% by volume, while natural gas (methane) burns at concentrations between 5.4 and 15%.
The temperature of spontaneous combustion is 585 deg.C, while that of natural gas is 540 deg.C.
Natural gas explodes at concentrations between 6.3 and 14%, while hydrogen requires concentrations from 13% to 64%.
The low thermal radiation characteristic of hydrogen flames, leads to a low probability that nearby materials could catch fire, which would reduce both the duration of a possible fire and the danger of toxic emissions.
Hydrogen, at variance with fossil fuels. Is not toxic, nor corrosive so that accidental losses from tanks do not cause problems from soil or acquifer pollution.
Hydrogen, unlike other forms of energy is not a static source, but a vector, that is to say it is made available whenever needed, does not need to be transported, and is generated where it is used.
The use of hydrogen as a blend even in percentages around 7-35% is enough to increment the combustion efficiency in a traditional endothermic engine by reducing the total fuel consumption and nearly totally abating polluting emissions of Cox and HC
Hydrogen should not be considered a future resource, as some people would have us believe, but a usable energy source which has already been technologically and commercially available ready to change our concept of energy usage.