On-line Dictionary
Vacuum
Vacuum
n.
A
space
entirely
devoid
of
matter
(
called
also
, by
way
of
distinction
,
absolute
vacuum
);
hence
, in a
more
general
sense
, a
space
, as
the
interior
of a
closed
vessel
,
which
has
been
exhausted
to a
high
or
the
highest
degree
by an
air
pump
or
other
artificial
means
; as,
water
boils
at a
reduced
temperature
in a
vacuum
.
Vacuum
n.
The
condition
of
rarefaction
, or
reduction
of
pressure
below
that
of
the
atmosphere
, in a
vessel
, as
the
condenser
of a
steam
engine
,
which
is
nearly
exhausted
of
air
or
steam
,
etc
.; as, a
vacuum
of 26
inches
of
mercury
, or 13
pounds
per
square
inch
.
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