kilogram per square metre
SI coherent derived unit
|kg m−2||surface density|
The kilogram per square metre, symbol kg m−2, is the SI coherent derived unit of surface density.
An area of one square metre with a mass of one kilogram has a surface density of one kilogram per square metre.
The surface density of paper is measured in units of grams per square metre, symbol g/m2.
Body mass index
Body mass index (BMI) is defined as body mass divided by the square of body height. BMI is expressed in units of kg/m2, although in common use the units are generally omitted.