| environ. |
bitumen A generic term applied to natural inflammable substances of variable colour, hardness, and volatility, composed principally of a mixture of hydrocarbons substantially free from oxygenated bodies. Bitumens are sometimes associated with mineral matter, the nonmineral constituents being fusible and largely soluble in carbon disulfide, yielding water-insoluble sulfonation products. Petroleum, asphalts, natural mineral waxes, and asphaltites are all considered bitumens (一个通用的术语适用于那些自然易燃物质，该物质颜色、硬度可变，具有挥发性，主要由从含氧机体中得到的碳氢化合物的混合物组成。沥青有时候和矿物质相联系，易燃的，可大量融于二硫化碳(水不溶性磺化产品)的非矿物质的成分。石油，沥青，天然矿物蜡及沥青柏油都被认为是沥青。) |
