kilogram per square metre
SI coherent derived unit
| Name | Symbol | Derived quantity | ||
| kilogram per square metre |
kg m−2 | surface density |  |
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DefinitionThe 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. |
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Paper
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.
Metric System 