spec. Fluid or gas pressure in excess of that which is normal or allowed for; an instance of this.
单词 | θ75625 |
释义 | the world > matter > physics > mechanics > force > [noun] > pressure > fluid pressure > specific (7) overpressure1819 spec. Fluid or gas pressure in excess of that which is normal or allowed for; an instance of this. head of steam1820 A confined body of steam under pressure, esp. as a source of power; the pressure of such steam. Frequently in full head of steam. Cf. sense 44b. pressure head1856 The pressure exerted by a fluid, expressed as the height of a column of the fluid which would produce that pressure by virtue of its weight. Cf. head… velocity head1884 the velocity pressure of a fluid expressed in terms of the height from which the fluid would have to fall to attain the velocity exerting this… velocity pressure1904 that part of the total pressure exerted by a fluid which is due to the velocity it possesses. impact pressure1919 the total pressure in a moving fluid in the direction of flow, being equal (in the case of a fluid of negligible viscosity) to the sum of the… impact head1928 = impact pressure n. |
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