gases 音标拼音: [g'æsəz] [g'æsɪz]
n . 气体
气体
Gas \
Gas \ (
g [
a ^]
s ),
n .;
pl . {
Gases } (
g [
a ^]
s "[
e ^]
z ). [
Invented by the chemist Van Helmont of Brussels ,
who died in 1644 .]
1 .
An a ["
e ]
riform fluid ; --
a term used at first by chemists as synonymous with air ,
but since restricted to fluids supposed to be permanently elastic ,
as oxygen ,
hydrogen ,
etc .,
in distinction from vapors ,
as steam ,
which become liquid on a reduction of temperature .
In present usage ,
since all of the supposed permanent gases have been liquified by cold and pressure ,
the term has resumed nearly its original signification ,
and is applied to any substance in the elastic or a ["
e ]
riform state .
[
1913 Webster ]
2 . (
Popular Usage )
(
a )
A complex mixture of gases ,
of which the most important constituents are marsh gas ,
olefiant gas ,
and hydrogen ,
artificially produced by the destructive distillation of gas coal ,
or sometimes of peat ,
wood ,
oil ,
resin ,
etc .
It gives a brilliant light when burned ,
and is the common gas used for illuminating purposes .
(
b )
Laughing gas .
(
c )
Any irrespirable a ["
e ]
riform fluid .
[
1913 Webster ]
3 .
same as {
gasoline }; --
a shortened form .
Also ,
the accelerator pedal of a motor vehicle ;
used in the term "
step on the gas ".
[
PJC ]
4 .
the accelerator pedal of a motor vehicle ;
used in the term "
step on the gas ".
[
PJC ]
5 .
Same as {
natural gas }.
[
PJC ]
6 .
an exceptionally enjoyable event ;
a good time ;
as ,
The concert was a gas . [
slang ]
[
PJC ]
Note :
Gas is often used adjectively or in combination ;
as ,
gas fitter or gasfitter ;
gas meter or gas -
meter ,
etc .
[
1913 Webster ]
{
Air gas } (
Chem .),
a kind of gas made by forcing air through some volatile hydrocarbon ,
as the lighter petroleums .
The air is so saturated with combustible vapor as to be a convenient illuminating and heating agent .
{
Gas battery } (
Elec .),
a form of voltaic battery ,
in which gases ,
especially hydrogen and oxygen ,
are the active agents .
{
Gas carbon }, {
Gas coke },
etc .
See under {
Carbon }, {
Coke },
etc .
{
Gas coal },
a bituminous or hydrogenous coal yielding a high percentage of volatile matters ,
and therefore available for the manufacture of illuminating gas . --
R .
W .
Raymond .
{
Gas engine },
an engine in which the motion of the piston is produced by the combustion or sudden production or expansion of gas ; --
especially ,
an engine in which an explosive mixture of gas and air is forced into the working cylinder and ignited there by a gas flame or an electric spark .
[
1913 Webster ]
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