Atmospheric
Definition of Atmospheric
At`mos`pher´ic
a.
1.
Of or
pertaining
to the
atmosphere
; of the
nature
of, or
resembling
, the
atmosphere
; as,
atmospheric
air
; the
atmospheric
envelope
of the
earth
.
2.
Existing
or
occurring
in the
atmosphere
.
The
lower
atmospheric
current
.
- Darwin.
3.
Caused
, or
operated
on, by the
atmosphere
; as, an
atmospheric
effect
; an
atmospheric
engine
.
4.
Dependent
on the
atmosphere
.
In am so
atmospherical
a
creature
.
- Pope.
Atmospheric engine
a
steam
engine
whose
piston
descends
by the
pressure
of the
atmosphere
, when the
steam
which
raised
it is
condensed
within
the
cylinder
.
Atmospheric line
(Steam Engin.)
the
equilibrium
line
of an
indicator
card
.
Steam
is
expanded
"down to the
atmosphere
" when its
pressure
is
equal
to that of the
atmosphere
. (See
Indicator card
.
- Tomlinson.
Atmospheric pressure
the
pressure
exerted
by the
atmosphere
, not
merely
downwards
, but in every
direction
. In
amounts
to about 14.7
Ibs
. on each
square
inch
.
Atmospheric railway
one in which
pneumatic
power
,
obtained
from
compressed
air
or the
creation
of a
vacuum
, is the
propelling
force
.
Atmospheric tides
See under
Tide
.
Related Words
air
,
atmosphere
,
atmospherical
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