Area density

The mass assignment ( also ground ( s) covering ) is called in physics the ratio of mass and surface a layer ( in the broadest sense ). The metric unit is kg / m ( kilograms per square meter ). In many other areas, this size is wrongly called basis weight, the standard-compliant designation grammage is less often used. In the paper and printing industry as well as in the polymer processing industry is next grammage (G ) are common.

For inhomogeneous density distributions can be the mass density calculated as an integral over the mass density and path.

Physical fields of application are the absorption of radiation (see mass attenuation coefficient) and the calculation of vibrations of plates and membranes.

When it comes to vibrations of beams or strings ( string vibration ) is, with mass density, the mass per unit length denoted ( unit kg / m).

• Physical size