a non-metallic, multivalent element of the nitrogen family that occurs especially as phosphates. Sometimes used in steel as it enhances the strength and makes it better able to resist abrasion.
phenomenon occurring when matter passes from a gaseous state to a solid state without liquefying or passing directly from a solid to a vapor state.
in water, this term refers to clear water that is suspected as polluted. May also refer to “muddy” or “stirred-up” water resulting in suspension of mud or bottom sand.
the process by which exposure to sunlight deteriorates the properties of materials.
a substance, usually crystalline, separated out from a solution as a solid.
as applied to gas, specific gravity is the ratio of the weight of a given volume to that of the same volume of air, both measured at the same temperature and pressure.
an increase in temperature that occurs while cooling metal through a range of temperatures in which change in structure occurs.