| 单词 | viscosity index |
| 释义 | > as lemmasviscosity index viscosity index n. a number expressing the degree to which the viscosity of an oil is unaffected by temperature. ΘΚΠ the world > matter > chemistry > physical chemistry > viscosity > [noun] > of an oil viscosity index1929 1929 Dean & Davis in Chem. & Metallurgical Engin. XXXVI. 618/1 This system of classification permits expressing the viscosity-temperature coefficient of an oil as a simple function of its Saybolt Universal viscosities at 100 and 210 deg. F. This function, hereafter referred to as the ‘viscosity index’, is independent of the actual viscosity of the oil. 1977 Lubricants Business (Shell Internat. Petroleum Co.) 3 These [additives] are chemical compounds which supplement the properties of the mineral base oil; for example, to reduce wear of moving parts..and to improve viscosity index. < as lemmas |
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