Some fields of engineering in the United States use a system of measurement of physical quantities known as the English Engineering Units. The system is based on English units of measure.
The English engineering system of units is an inconsistent set of units still in use in the field of chemical engineering in the United States. (A somewhat similar consistent system is termed "British engineering units" by Halliday and Resnick; that system uses the slug as the unit of mass.) The set is defined by the following units, with a comparison to the standard units based on the International System of Units.
Units for other physical quantities are derived from this set as needed.
 See also