Onedensity

Onedensity is a term used in several disciplines to denote a density normalized to a unit value. Because it is not a standard technical term, its precise meaning varies by context.

In physics and materials science, a one-density reference often means a unit mass density, typically 1 gram per cubic centimeter (1 g/cm3) under standard conditions. Materials with density close to this value are described as having near-one density relative to water.

In mathematics and statistics, onedensity may refer to a density function that integrates to one, i.e., a probability density function. In this informal sense, a one-density is a normalized density.

In computing and data analysis, density estimation methods produce functions treated as densities that sum to one over the domain; again, one-density is a casual way to note normalization rather than a formal term.

Due to its informal status, onedensity appears mainly as a descriptor in technical discussions rather than as a defined, stand-alone concept. See also density, mass density, probability density function, and kernel density estimation.