hydrometer 音标拼音: [hɑɪdr'ɑmətɚ]
n . 液体比重计,浮秤
液体比重计,浮秤
hydrometer n 1 :
a measuring instrument for determining the specific gravity of a liquid or solid [
synonym : {
hydrometer }, {
gravimeter }]
Hydrometer \
Hy *
drom "
e *
ter \,
n . [
Hydro -,
1 -
meter :
cf .
F .
hydrom [`
e ]
tre .]
1 . (
Physics )
An instrument for determining the specific gravities of liquids ,
and thence the strength spirituous liquors ,
saline solutions ,
etc .
[
1913 Webster ]
Note :
It is usually made of glass with a graduated stem ,
and indicates the specific gravity of a liquid by the depth to which it sinks in it ,
the zero of the scale marking the depth to which it sinks in pure water .
Extra weights are sometimes used to adapt the scale to liquids of different densities .
[
1913 Webster ]
2 .
An instrument ,
variously constructed ,
used for measuring the velocity or discharge of water ,
as in rivers ,
from reservoirs ,
etc .,
and called by various specific names according to its construction or use ,
as {
tachometer },
{
rheometer }, {
hydrometer }, {
pendulum },
etc .;
a current gauge .
Hydrometric HYDROMETER .
An instrument for measuring the density of fluids ;
being immersed in fluids ,
as in water ,
brine ,
beer ,
brandy , &
c .,
it determines the proportion of their densities ,
or their specific gravities ,
and thence their qualities .
2 .
By ,
the Act of Congress of January 12 ,
1825 ,
3 Story '
s '
Laws U .
S .
1976 ,
the secretary of the treasury is authorized ,
under the direction of the president of the United States ,
to adopt and substitute such hydrometer as he may deem best calculated to promote the public interest ,
in lieu of that now prescribed by law ,
for the purpose of ascertaining the proof of liquors ;
and that after such adoption and substitution ,
the duties imposed by law upon distilled spirits shall be levied ,
collected and paid ,
according to the proof ascertained by any hydrometer so substituted and adopted .
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