1 By comparison, machine shops also cut metal, but they are more concerned with the machining of parts on machine tools. 2  Firms that encompass both fab work and machining are also common. 3  Blacksmithing has always involved fabrication, although it was not always called by that name.
When water is in its solid state (ice) , the water molecules are packed close together preventing it from changing shape. Ice has a very regular pattern with the molecules rigidly apart from one another connected by the hydrogen bonds that form a crystalline lattice.
Not to be confused with hard water or tritiated water. Heavy water (deuterium oxide, 2. H. 2O) is a form of water that contains a larger than normal amount of the hydrogen isotope deuterium (2. H or D, also known as heavy hydrogen), rather than the common hydrogen-1 isotope (1. H or H, also called protium) that makes up most of the hydrogen in normal water.