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.
Steel is made from iron, and in the process, some element percentages are reduced in the alloy composition (such as carbon and silicon), and other elements (such as chromium, nickel, and tungsten) are added, depending on the type of steel needed.Other People Are Reading.ilicon (Electrical) Steel. This steel is used in motors and generators and has a composition of about 0.6 to 5 percent silicon (Si), with one specific steel made of 0.4 percent carbon, 2 percent silicon, and 97.6 percent iron.