Density vs. Gsm

(physics) A measure of the mass of matter contained by a unit volume.

The ratio of one quantity to another quantity.

Example: ‘The number of particles per unit volume of a specified volume can be considered to be the particle density for the specified volume.’;

The probability that an event will occur, as a function of some observed variable.

The quality of being dense, close, or thick; compactness; - opposed to rarity.

The ratio of mass, or quantity of matter, to bulk or volume, esp. as compared with the mass and volume of a portion of some substance used as a standard.

Depth of shade.

the amount per unit size

the spatial property of being crowded together

The density (more precisely, the volumetric mass density; also known as specific mass), of a substance is its mass per unit volume. The symbol most often used for density is ρ (the lower case Greek letter rho), although the Latin letter D can also be used.

(unit for measuring the weight of paper)