nitrogen 音标拼音: [n'ɑɪtrədʒən]
n .
U 氮
U 氮
nitrogen n 1 :
a common nonmetallic element that is normally a colorless odorless tasteless inert diatomic gas ;
constitutes 78 percent of the atmosphere by volume ;
a constituent of all living tissues [
synonym : {
nitrogen }, {
N }, {
atomic number 7 }]
Nitrogen \
Ni `
tro *
gen \ (
n [
imac ]"
tr [-
o ]*
j [
e ^]
n ),
n . [
L .
nitrum natron -
gen :
cf .
F .
nitrog [`
e ]
ne .
See {
Niter }.] (
Chem .)
A colorless nonmetallic element of atomic number 7 ,
tasteless and odorless ,
comprising four fifths of the atmosphere by volume in the form of molecular nitrogen ({
N2 }).
It is chemically very inert in the free state ,
and as such is incapable of supporting life (
hence the name {
azote }
still used by French chemists );
but it forms many important compounds ,
such as ammonia ,
nitric acid ,
the cyanides ,
etc ,
and is a constituent of all organized living tissues ,
animal or vegetable .
Symbol N .
Atomic weight 14 .
007 .
It was formerly regarded as a permanent noncondensible gas ,
but was liquefied in 1877 by Cailletet of Paris ,
and Pictet of Geneva ,
and boils at -
195 .
8 [
deg ]
C at atmospheric pressure .
Liquid nitrogen is used as a refrigerant to store delicate materials ,
such as bacteria ,
cells ,
and other biological materials .
[
1913 Webster PJC ]
46 Moby Thesaurus words for "
nitrogen ":
acetylene ,
ammonia ,
argon ,
asphyxiating gas ,
butane ,
carbon dioxide ,
carbon monoxide ,
castor -
bean meal ,
chlorine ,
coal gas ,
commercial fertilizer ,
compost ,
dressing ,
dung ,
enrichener ,
ethane ,
ether ,
ethylene ,
fertilizer ,
fluorine ,
formaldehyde ,
guano ,
helium ,
hydrogen ,
illuminating gas ,
krypton ,
lewisite ,
manure ,
marsh gas ,
methane ,
muck ,
mustard gas ,
natural gas ,
neon ,
night soil ,
nitrate ,
organic fertilizer ,
oxygen ,
ozone ,
phosphate ,
poison gas ,
propane ,
radon ,
sewer gas ,
superphosphate ,
xenon
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