numberdensity
Number density, often denoted by n, is a measure of the concentration of particles in a given volume. It quantifies how many individual entities, such as atoms, molecules, electrons, or galaxies, are present within a specified space. The standard unit for number density in the International System of Units (SI) is particles per cubic meter (m⁻³).
To calculate number density, one divides the total number of particles by the total volume they occupy.
In astronomy, number density is applied to celestial objects. For example, astronomers might discuss the number