Glossary

The mass of water vapor per unit volume of air.

A plastic of acrylonitrile-butadienestyrene; has good resistance to impact, heat, and chemicals; esp. used for piping.

A surface discontinuity caused by roughening or scratching.

A measure of the abrasion resistance of a vulcanized material or synthetic rubber compound relative to that of a standard rubber compound under

A hard substance for removing material by grinding, lapping, honing, and polishing. Common abrasives include silicon carbide, boron carbide, diamond, emery, garnet,

A red ocher used to stain mahogany.

The ability of a surface to resist being worn away or to maintain its original appearance when rubbed with another object.