Chapter N: N NWSA

N

n

(1) The symbol for spindle speed; (2) symbol for nano-. SI system prefix for 10 ^-9; (3) symbol for unspecified number; (4) symbol for rotational frequency ( n-italic).

N

(1) Symbol for Avogadro's number, (6.023 x 10 ²³); (2) symbol for the element nitrogen; (3) symbol for newton.

Na

Symbol for the element sodium.

NADCA

Abbreviation for North American Die Casting Association.

naphthalene

[C ₁₀H ₈] A white crystalline solid used in metal cutting fluids.

National Association of Metal Finishers (NAMF)

112 J, Elden Street, Herndon VA 20170. Telephone: 703/709-8299. Web: http://www.namf.org

National Certified Pipe Welding Bureau (NCPWB)

1385 Picard Drive, Rockville, MD 20850-4329. Telephone: 301/869-5800; 800/556-3653. FAX 301/990-9690. WEB: http://www.mcaa.org A division of the Mechanical Contractors Association of America, Inc (MCAA). Its purpose is to develop and test procedures and, through its local chapters, to establish pools of people qualified to weld under these procedures.

National Electrical Manufacturers Association (NEMA)

1300 N. 17 ^th Street, Suite 1847, Rosslyn VA 22209. Telephone: 703/841-3200. FAX: 703/841-5900. WEB: http://www.nema.org An industry association of manufacturers of electrical machinery. Publishes standards and industry statistics including welding.

National Fire Protection Association (NFPA)

1 Batterymarch Park, Quincy MA 02269-910. Telephone: 1-800-344-3555. Web: http://www.nfpacatalog.org

An international membership organization established to promote the science and improve the methods of fire protection and prevention, and establish safeguards against loss of life and property by fire. Best known in industry for the National Fire Codes and the National...