| 单词 | triple point |
| 释义 | > as lemmastriple point triple point n. (a) (Geometry), a point common to three branches of a curve, or at which the curve has three tangents: see triple line n.; (b) (Physics), the temperature and pressure at which the solid, liquid, and vapour phases of a pure substance can coexist in equilibrium; the point representing this state in a phase diagram (marked by the junction of three lines); more widely, an analogous state or point for any three phases of a substance; (c) (Geology), an invariant point involving three phases, e.g. where kyanite, andalusite, and sillimanite are stable in the system Al2 SiO5. ΘΚΠ the world > relative properties > number > geometry > point > [noun] > on a curve first polar1836 umbilic1843 spinode1852 stationary point1856 ineunt1859 triple point1872 tacnode-cusp1873 the world > matter > chemistry > physical chemistry > phases > [noun] > phase transitions > points triple point1872 isosbestic point1925 1872 J. Thomson in Rep. Brit. Assoc. Advancem. Sci. 1871 ii. 32 We must suppose three curves (namely, the line between gas and liquid, the line between liquid and solid, and the line between gas and solid) to meet in one point... This point of pressure and temperature for any substance may then be called the triple point for that substance. 1873 B. Williamson Elem. Treat. Differential Calculus (ed. 2) xiv. §209 If the lowest terms in the equation of a curve be of the third degree, the origin is a triple point. 1879 Encycl. Brit. VIII. 731/2 At this point the steam line, ice line, and hoar-frost line intersect, and it has therefore been called the triple point. 1955 Sci. Amer. Mar. 52/3 In another change, the absolute temperature scale was redefined in terms of a single fixed reference point—the triple point of water. 1964 J. H. Brophy et al. Thermodynamics of Struct. ii. 20 If the specified temperature and pressure are the coordinates of point D, all three phases coexist in equilibrium with one another. Point D is called the triple point. 1966 Units & Standards of Measurem.: Temperature (Nat. Physical Lab.) (ed. 2) 18 Changes made in 1960 to the text of the International Temperature Scale of 1948... The triple-point of water was given formal status as one of the defining fixed points of the scale... Its value was given as 0·01°C (Int. 1948) and the ice point appeared among the secondary fixed points with the value 0·000°C. 1978 Nature 14 Dec. 696/2 One possible reason..is that a solid–solid–liquid triple point could exist near 107 Pa..in the proposed phase diagram [of carbon]. 1979 K. G. Cox et al. Interpretation of Igneous Rocks iii. 47 Figure 3.1 shows a one-component phase diagram for a substance such as H2O. It consists of three fields in each of which a single phase exists. Each pair of fields meets in a curve along which two phases co-exist, and the three fields meet in a point U (so-called triple point) at which all three phases co-exist. 1983 D. S. Barker Igneous Rocks iii. 28 The ‘triple point’ where liquid, vapor, and solid coexist in equilibrium has yet to be experimentally located for any silicate. < as lemmas |
| 随便看 |
英语词典包含1132095条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。