| 释义 |
outgas, v.|aʊtˈgæs|
[out- 26.]
1. trans.
a. To drive off sorbed gas or vapour from (a solid), esp. by heating in a vacuum.
1921[implied in outgassed ppl. a.]. 1925Physical Rev. XXVI. 658 When the surface layer of gas is removed from a fresh specimen the increase in the photo-electric current is greater than the decrease from the maximum value as the specimen is outgassed. 1953Electronic Engin. XXV. 19 The cathodes were out-gassed by eddy-current heating. 1965C. M. Van Atta Vacuum Sci. & Engin. iii. 101 After the gauge tube and elements have been thoroughly outgassed, an opposite effect becomes noticeable.
b. To release (sorbed or dissolved gas or vapour).
1971I. G. Gass et al. Understanding Earth ix. 137/2 Only gradually, as volcanoes continued to outgas volatile products still trapped in the mantle, will a secondary atmosphere and ocean have replaced the primary envelope. 1974Nature 31 May 438/1 If NH3 is outgassed from the Martian crust it would be photolysed.
2. intr. To give off sorbed gas or vapour.
1962[implied in outgassing vbl. n.]. 1965C. M. Van Atta Vacuum Sci. & Engin. ix. 365 Untreated metal samples outgas at the rate of about 10-7 torr liter/sec cm2 after 1 hr of vacuum pumping at room temperature. 1975Sci. Amer. Feb. 110/3 Any polymer surface will outgas (a ‘virtual leak’ into your clean volume) two orders of magnitude more than steel.
So outˈgassed ppl. a., outˈgassing vbl. n.
1921Proc. Nat. Acad. Sci. VII. 115 The coarsely granular sample of the thoroughly outgassed material is weighed and placed in a steel pressure bomb which is then evacuated until all adsorbed gases are removed. 1925Physical Rev. XXVI. 657 His thermionic measurements show that the value of A in the Richardson equation..decreases from 4·76 × 1027 for the slightly outgassed position to 1·7 × 1026 for continued outgassing. 1952Trans. Faraday Soc. XLVIII. 739 The vessel F was ‘protected’ by a series of traps in liquid air, some of which..contained carefully outgassed granulated charcoal. 1962F. I. Ordway et al. Basic Astronautics iii. 49 Whatever outgassing that may occur from the surface would expectedly give rise to a more substantial, albeit tenuous, atmosphere. 1971I. G. Gass et al. Understanding Earth ii. 43/2 This so-called ‘excess’ argon is probably produced by heating and outgassing of ancient, potassium-bearing rocks. 1973Nature 3 Aug. 272/2 The relative abundances of these gases will depend critically on the subsequent history of the outgassed methane. 1973B. J. Williams Evolution & Human Origins vii. 97/2 If these dates are correct then the evolution of life must have begun, as we would expect, almost immediately after the earth's crust melted and the outgassing of the early atmospheric gases ceased. |