600 km 372 mile hydrogen heavy goods vehicle HGV Warwickshire Horiba Mira test track emits water?

hydrogen in an internal combustion engine can "work" over a wider range of fuel-air mixtures that gas/diesel & lean fuel-air mixtures below the theoretical chemically ideal , stoichiometric amount needed for combustion with a given amount of air gives greater fuel economy more complete combustion at lower combustion temperatures which reduces the amount of pollutants & allows a lighter engine

air hydrogen combustion engines are not zero emission & just like coal diesel/oil will produce NOx nitric oxide NO & or nitrogen dioxide NO2 unless you include O2 tanks that can rupture & result in high velocity frictional heat that may ignite the cylinder AS fuel see also Pure oxygen deep-sea diving tanks used to avoid nitrogen bends

most air is
78.% N2 Nitrogen
21.% O2 Oxygen
01.% Ar Argon
.04% CO2 Carbon dioxide

600 km 372 mile hydrogen heavy goods vehicle HGV Warwickshire Horiba Mira test track

https://en.wikipedia.org/wiki/Hydrogen_vehicle
https://en.wikipedia.org/wiki/Hydrogen_internal_combustion_engine_vehicle
https://en.wikipedia.org/wiki/NOx
https://youtu.be/NaYVZEDrktE

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