| 单词 |
compressibility |
| 释义 |
compressibility|kəmprɛsɪˈbɪlɪtɪ|
[f. next + -ity; cf. F. compressibilité.]
a. The quality of being compressible; capability of compression.
1789W. Buchan Dom. Med. (1790) 605 The compressibility of sponge. 1836Todd Cycl. Anat. I. 502 The extraordinary compressibility of the other viscera.
b. esp. in Physics and Aeronaut. The quality in virtue of which the volume of a gas, etc., may be diminished without decrease of its mass.
a1691Boyle Wks. (1772) III. 507 The great compressibility, if I may so speak, of the air. 1830Herschel Stud. Nat. Phil. 237 The compressibility..of ice is very nearly the same with that of water. 1860Maury Phys. Geog. Sea viii. §404 The Compressibility of water in the depths of the sea, is one per cent for every 1000 fathoms. 1920L. Bairstow Appl. Aerodynamics viii. 383 For airscrews, the tips of the blades of which may reach speeds of 700 or 800 ft.-s., the effect of compressibility may be expected to be important. 1933J. Stack in Nat. Advis. Comm. Aeronaut., Techn. Rep. No. 463 18 This breakdown of the flow, hereinafter called the compressibility burble, occurs at lower speeds as the lift is increased by changing the angle of attack. 1938L. Bairstow Appl. Aerodynamics (ed. 2) i. 10 At about three-quarters of the velocity of sound..the lift of aerofoils falls rapidly and the drag increases enormously, giving rise to a phenomenon sometimes spoken of as the ‘compressibility stall’. 1950Gloss. Aeronaut. Terms (B.S.I.) i. 26 Compressibility drag, the increase in drag arising from the compressibility of the air which occurs at high speeds. |
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