On-line Dictionary
Hydrogen
Hydrogen
n.
A
gaseous
element
,
colorless
,
tasteless
,
and
odorless
,
the
lightest
known
substance
,
being
fourteen
and
a
half
times
lighter
than
air
(
hence
its
use
in
filling
balloons
),
and
over
eleven
thousand
times
lighter
than
water
. It is
very
abundant
,
being
an
ingredient
of
water
and
of
many
other
substances
,
especially
those
of
animal
or
vegetable
origin
. It
may
by
produced
in
many
ways
,
but
is
chiefly
obtained
by
the
action
of
acids
(as
sulphuric
) on
metals
, as
zinc
,
iron
,
etc
. It is
very
inflammable
,
and
is an
ingredient
of
coal
gas
and
water
gas
. It is
standard
of
chemical
equivalents
or
combining
weights
,
and
also
of
valence
,
being
the
typical
monad
.
Symbol
H.
Atomic
weight
1.
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