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Niello
A black alloy used as a decorative inlay in metal surfaces. Made from silver, lead, copper, and sulfur.

Night seal
A temporary sheet covering of synthetic, waterproof material used to cover an opening in a roof until construction is complete.

Nineteen-inch selvage
Also referred to as wide selvage asphalt or SIS, this asphalt roofing has a 17 inch granulated surface and 19 inch non-granulated.

Ninety-pound
Granule-surfaced or fiber glass or organic felt roll roofing that has a mass of approximately 90 pounds per 100 square feet.

Nippers
Wire cutters.

Nipple
A short length of pipe installed between couplings or other fittings.

Nipple extractor
A tool used to unscrew sections of pipe.

Nipple extractor
A tool used to unscrew sections of pipe.

Nitrogen cycle
The transformation of nitrogen from an atmospheric gas to organic compounds in the soil, then to compounds in plants and eventually the release of nitrogen gas back into the atmosphere.

Nitrogen dioxide
This compound of nitrogen and oxygen is formed by the oxidation of nitric oxide (NO) which is produced by the combustion of solid fuels.

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