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Atmospheric pressure
(gcide) | Pressure \Pres"sure\ (?; 138), n. [OF., fr. L. pressura, fr.
premere. See 4th Press.]
1. The act of pressing, or the condition of being pressed;
compression; a squeezing; a crushing; as, a pressure of
the hand.
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2. A contrasting force or impulse of any kind; as, the
pressure of poverty; the pressure of taxes; the pressure
of motives on the mind; the pressure of civilization.
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Where the pressure of danger was not felt.
--Macaulay.
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3. Affliction; distress; grievance.
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My people's pressures are grievous. --Eikon
Basilike.
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In the midst of his great troubles and pressures.
--Atterbury.
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4. Urgency; as, the pressure of business.
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5. Impression; stamp; character impressed.
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All saws of books, all forms, all pressures past.
--Shak.
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6. (Mech.) The action of a force against some obstacle or
opposing force; a force in the nature of a thrust,
distributed over a surface, often estimated with reference
to the amount upon a unit's area.
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7. Electro-motive force.
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Atmospheric pressure, Center of pressure, etc. See under
Atmospheric, Center, etc.
Back pressure (Steam engine), pressure which resists the
motion of the piston, as the pressure of exhaust steam
which does not find free outlet.
Fluid pressure, pressure like that exerted by a fluid. It
is a thrust which is normal and equally intense in all
directions around a point. --Rankine.
Pressure gauge, a gauge for indicating fluid pressure; a
manometer.
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Atmospheric pressure
(gcide) | Atmospheric \At`mos*pher"ic\, Atmospherical \At`mos*pher"ic*al\,
a. [Cf. F. atmosph['e]rique.]
1. Of or pertaining to the atmosphere; of the nature of, or
resembling, the atmosphere; as, atmospheric air; the
atmospheric envelope of the earth.
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2. Existing or occurring in the atmosphere.
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The lower atmospheric current. --Darwin.
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3. Caused, or operated on, by the atmosphere; as, an
atmospheric effect; an atmospheric engine.
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4. Dependent on the atmosphere. [R.]
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In am so atmospherical a creature. --Pope.
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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. --Tomlinson.
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.)
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.
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atmospheric pressure
(wn) | atmospheric pressure
n 1: the pressure exerted by the atmosphere [syn: {atmospheric
pressure}, air pressure, pressure] |
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