pressure headn.
/ˈprɛʃə ˌhɛd/, U.S. /ˈprɛʃər ˌhɛd/ 1. 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 n.1 44b.
ΘΚΠ
the world > matter > physics > mechanics > force > [noun] > pressure > fluid pressure > specific
overpressure1819
head of steam1820
pressure head1856
velocity head1884
velocity pressure1904
impact pressure1919
impact head1928
1856 Jrnl. Soc. Arts 18 Jan. 144/2 There must be a pressure-head of ample weight.
1907 S. M. Woodward & J. Preston tr. E. Sorel Carbureting & Combustion in Alcohol Engines viii. 160 Let..H = pressure head on the liquid.
1941 Sci. Monthly Jan. 34/2 The inhalation of 100 per cent. oxygen is the most effective and practical method of eliminating the nitrogen by establishing a high pressure head from tissues to lungs.
1974 J. A. Fox Introd. Engin. Fluid Mech. viii. 283 A velocity change of 1 ft/s can generate a pressure head of approximately 125 ft if it occurs rapidly enough.
1996 Victorian Soc. Ann. 1995 18/1 They [sc. water towers] provided an invaluable resource in case of fire with the necessary pressure head to play water onto the roofs of buildings.
2. Aeronautics. A pitot-static tube.
ΘΚΠ
society > travel > air or space travel > a means of conveyance through the air > aeroplane > parts of aircraft > controls and instruments > [noun] > pitot tube or pitot-static tube
pitot tube1852
static tube1892
static pressure tube1903
pitot head1910
pressure head1913
pitot1920
pitot-static1920
1913 Times 11 June 26/5 A further error may be introduced by using too small pipes for connecting the U tube to the pressure head at the wing tip.
1964 E. H. J. Pallett Aircraft Instrument Man. ii. 11 Pressure heads now in general use are..electrically heated.
1995 B. Gunston Osprey Encycl. Russian Aircraft 1875 –1995 206/2 Other changes:..air-data boom with forward-facing pressure head and three rows of static holes relocated on fixed mount above nose.
This entry has been updated (OED Third Edition, March 2007; most recently modified version published online March 2022).
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n.1856