Business / Machine Shop / Nitrogen: A gaseous element that occurs freely in nature and constitutes about 78% of earth’s atmosphere. Colorless, odorless and relatively inert, although it combines directly with magnesium, lithium and calcium when heated with them. Produced either by liquefaction and fractional distillation of air, or by heating a water solution of ammonium nitrate.

Nitrogenous Base

Science / Genetics / Nitrogenous Base: A nitrogen-containing molecule having the chemical properties of a base. Dna contains the nitrogenous bases adenine (a), guanine (g), cytosine (c), and thymine (t). MORE

Nitrogen (N)

Science / Periodic Table of Elements / Nitrogen (N): Atomic number: 7, Atomic mass: 14.0067 g.mol -1, Electronegativity: 3.0, Density: 1.25*10-3 at 20°C, Melting point: -210 °C, Boiling point: -195.8 °C, Vanderwaals radius: 0.092 nm, Ionic rad MORE

Nitrogen Fixation

Science / Marine Biology / Nitrogen Fixation: The conversion of gaseous nitrogen to nitrate by specialized bacteria. MORE