Template:Concentration and density

Concentration and density in different formats

Concentration is an extensive quantity divided by volume V, or a count divided by volume V. The elementary entities X (or B) or the sample type s have to be specified in the text or indicated by a subscript or in parentheses. Examples: cell-count concentration C_ce; count concentration of protons C_H⁺; molar concentration of protons c_H⁺. Density is not only 'mass density ρ, but is used for many extensive quantities divided by volume or area.

Concentration	Symbol	Definition	Unit	Note
Count concentration	CX	= NX·V-1	[x·L-1]	The IUPAC term 'number concentration' should be replaced by 'count concentration' (or 'number of entities concentration').
Amount concentration	cB	= nB·V-1	[mol·L-1]	Amount concentration is a counting concentration, converting the elementary unit [x] into moles [mol] using the Avogadro constant.
Charge concentration	CQX	= QX·V-1	[C·L-1]	Charge concentration is a counting concentration, converting the elementary unit [x] into coulombs C using the elementary charge, or converting moles [mol] into coulombs [C] using the Faraday constant. Charge density in electricity is 'charge per volume'.
Mass concentration of X	CmX	= mX·V-1	[kg·L-1]	Mass concentration CmX is mass of entities X per volume V of the mixture.
Mass density of S	ρS	= mS·VS-1	[kg·L-1]	Mass density ρS is mass of the pure sample S per volume VS of the pure sample; ρS is the reciprocal of specific volume.
Volume concentration of X	CVX	= VX·V-1	[L·L-1]	Volume concentration CVX is the volume of entities X per volume V of the mixture.
Volume density	ΦX	= VX·V-1	[L·L-1]	Volume density is equivalent to the volume fraction.