| 释义 |
porosity|pɒˈrɒsɪtɪ|
[ad. med.L. porōsitās (Albertus Magnus a 1250), f. L. type *porōs-us porous: see -ity. Cf. F. porosité.]
a. The quality or fact of being porous; porous consistence. Also, the degree to which a substance is porous (see quots.).
1398Trevisa Barth. De P.R. iv. ii. (1495) e v b/1 The porosytee of the tree drawyth þe fumosyte from the rynde. 1615Crooke Body of Man 385 This porosite also makes their vpper face smooth, and bedewed with a kind of slimy moisture. 1796Kirwan Elem. Min. (ed. 2) I. 231 It is the porosity of this stone that renders it so light. 1871Tyndall Fragm. Sc. (1879) I. v. 183 In virtue of its extreme porosity, a similar power is possessed by charcoal. 1939U.S. Dept. Agric. Yearbk. 1938 1174 Porosity, soil, degree to which the soil mass is permeated with pores or cavities. 1971Gloss. Soil Sci. Terms (Soil Sci. Soc. Amer.) 13/2 Porosity, the volume percentage of the total bulk not occupied by solid particles. 1975G. Anderson Coring i. 2 Porosity is a measure of the space in a rock not occupied by the solid structure or framework of the rock. It is defined as the fraction of the total bulk volume of the rock not occupied by solids. Ibid., A commercial oil⁓bearing sandstone can have varying porosities... The formation should contain at least 8–10% porosity before it can be considered commercially interesting.
b. concr. A porous part or structure; an interstice or pore. (Usually in pl.)
1597A. M. tr. Guillemeau's Fr. Chirurg. 9 b/2 The Diploe, that is, the porositye which is betweene them bothe [tables of skull]. 1669W. Simpson Hydrol. Chym. 284 Sudden floods filling the porosities and chanels of the superficies of the earth. 1831R. Knox Cloquet's Anat. 15 Found in the interstices of the laminæ of the compact tissue, and the porosities with which they seem perforated. |