Hydrogen Gas Hydrogen Gas is the simplest, lightest element in the Universe. It is made up of one proton & one electron. It is light as it scatters immediately upward in the air. It is non polluting. It is a energy carrier It is not energy it self, but requires energy to produce it. It has more energy per weight, but less energy per volume than any other fuel.It is normal gaseous state it is colourless, odourless, tasteless