brown
At normal room temeratures and pressures, hydrogen is a colorless, odorless, tasteless, non-toxic, nonmetallic, highly combustible gas.
its a colourless gas, and as such is transparent. I.e., no colour
Hydrogen bromide is a colorless gas at standard temperature and pressure.
Hydrogen chloride is a colorless gas at room temperature. When dissolved in water, it forms hydrochloric acid, which is also colorless.
Hydrogen's physical state at room temperature is a gas.
Hydrogen burns with a pale blue flame.
Hydrogen gas has no taste, colour or smell.
Hydrogen is a gas at room temperature.
At room temperature, hydrogen is in the gaseous phase.
Hydrogen bromide (HBr) is a gas at room temperature.
Hydrogen chloride gas is colorless.
colourless gas