The numerical result calculated by the formula for estimating the cetane number of distillate fuels from American Petroleum Institute (API) gravity and midboiling point.
用美国石油学会比重度和中沸点估算馏分燃料十六烷值公式计算得到的数值结果。
2
The swept source laser provides light intensity strong enough to easily measure even the lowest APIgravity crudes.
扫频激光光源提供了足量的光照强度，可以轻松测取低api度原油的参数。
3
Crude oil is commonly classified as light, medium or heavy, referring to its gravity as measured on the American Petroleum Institute (API) Scale.