Currently, most hydrogen is made this way from natural gas. An electrical current can also be used to separate water into its components of oxygen and hydrogen. This process is known as electrolysis. Some algae and bacteria, using sunlight as their energy source, even give off hydrogen under certain conditions.
Originally, metal roofs were made of corrugated galvanized steel: a wrought ironâsteel sheet was coated with zinc and then roll-formed into corrugated sheets. Another approach is to blend zinc, aluminum, and silicon-coated steel.
Well it boils down to how the atoms jiggle around in the material. ferromagnetic, antiferromagnetic, and paramagnetic materials are made up of a bunch of magnetic atoms (the ones with half-filled electron shells found in the middle of any of the major blocks of the periodic table).