Queen mattresses are the most popular mattress size today. With the dimensions of 60 inches wide by 80 inches long, the queen size mattress is a good choice guest rooms or couples that like to sleep closer together.
Industrial Fixation. Under great pressure, at a temperature of 600Â°C, and with the use of a catalyst, atmospheric nitrogen and hydrogen (usually derived from natural gas or petroleum) can be combined to form ammonia (NH3).
The beginning point for industrial production of nitrogen compounds is the Haber process, in which nitrogen is fixed by reacting N 2 and H 2 over an iron(II, III) oxide (Fe 3O 4) catalyst at about 500 Â°C and 200 atmospheres pressure.