Question

hydrogen gas is harmless or harmful​

Answer 1

Hydrogen isn't poisonous, but if you should breathe pure hydrogen you could die of asphyxiation simply because you'll be deprived of oxygen

Answer 2

hydrogen gas is highly flammable and will burn in air in concentrations between 4% and 75% by volume .hydrogen is not toxic but in its pure form is a chemical asphyxiant .hydrogen gas leaking into air may spontaneously ignite exposure to the liquefied gas can also frostbite

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