Area density
Mass per unit area / From Wikipedia, the free encyclopedia
Dear Wikiwand AI, let's keep it short by simply answering these key questions:
Can you list the top facts and stats about Area density?
Summarize this article for a 10 year old
SHOW ALL QUESTIONS
This article is about the property of two-dimensional objects. For other uses, see Density (disambiguation).
The area density (also known as areal density, surface density, superficial density, areic density, mass thickness, column density, or density thickness) of a two-dimensional object is calculated as the mass per unit area. The SI derived unit is the kilogram per square metre (kg·m−2). A related area number density can be defined by replacing mass in by number of particles or other countable quantity.
Quick Facts Common symbols, SI unit ...
Area density | |
---|---|
Common symbols | |
SI unit | kg/m2 |
In SI base units | m−2⋅kg |
Derivations from other quantities | |
Dimension |
Close
In the paper and fabric industries, it is called grammage and is expressed in grams per square meter (g/m2); for paper in particular, it may be expressed as pounds per ream of standard sizes ("basis ream").