The vast majority of the hydrogen produced today is "gray," "brown," or "black" hydrogen, which is made by using fossil fuels. As you might expect, "green" hydrogen costs much more to make than ...

Hydrogen sulfide dissolved in water corrodes metals such as iron, steel, copper and brass. The corrosion of iron and steel from sulfur forms ferrous sulfide or "black water." Hydrogen sulfide in water ...

Hot gases don’t produce a continuous emission spectrum. Black hydrogen absorption lines are at the same wavelength as the bright hydrogen emission lines. Key fact Line emission spectra are ...