Specific quantity
In the natural sciences, including physiology and engineering, a specific quantity generally refers to an intensive quantity obtained by the ratio of an extensive quantity of interest by another extensive quantity (usually mass or volume).Another kind of specific quantity, termed named specific quantity, is a generalization of the original concept.The divisor quantity is not restricted to mass, and name of the divisor is usually placed before "specific" in the full term (e.g., "thrust-specific fuel consumption").Named and unnamed specific quantities are given for the terms below.The dividing unit is sometimes added before the term "specific", and sometimes omitted.