nitrogen
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source:
By Cicle_del_nitrogen_de.svg: *Cicle_del_nitrogen_ca.svg: Johann Dréo (User:Nojhan), traduction de Joanjoc d'après Image:Cycle azote fr.svg.derivative work: Burkhard (talk)Nitrogen_Cycle.jpg: Environmental Protection Agencyderivative work: Raeky (talk) - Cicle_del_nitrogen_de.svgNitrogen_Cycle.jpg, CC BY-SA 3.0
noun
the
chemical
element
of
atomic
number 7
, a
colorless
,
odorless
unreactive
gas
that
form
s about 78 percent of the
earth
's
atmosphere
.
Liquid
nitrogen
(made by
distill
ing
liquid
air
)
boil
s at 77.4 kelvins (−195.8°C) and is used as a
coolant
. (Symbol:
N
)
ORIGIN
late
18th century
: from
French
nitrogène
(see
niter
,
-gen
).