Template:Concentration and density
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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 Cce; count concentration of protons CH+; molar concentration of protons cH+. 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 counting-unit [x] into moles [mol] using the Avogadro constant. Charge density ρe = QX·V-1 [C·L-1] Charge density in electricity is charge per volume. Charge density is a counting concentration, converting the counting-unit [x] into coulombs C using the elementary charge, or converting moles [mol] into coulombs [C] using the Faraday constant. Mass density of s ρs = ms·V-1 [kg·L-1] Mass density ρs is mass of sample s 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 density ΦX = VX·V-1 [L·L-1] Volume density is equivalent to the volume fraction.
Density of the pure sample
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 counting-unit [x] into moles [mol] using the Avogadro constant. Charge density ρe = QX·V-1 [C·L-1] Charge density in electricity is charge per volume. Charge density is a counting concentration, converting the counting-unit [x] into coulombs C using the elementary charge, or converting moles [mol] into coulombs [C] using the Faraday constant. Mass density of s ρs = ms·V-1 [kg·L-1] Mass density ρs is mass of sample s 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 density ΦX = VX·V-1 [L·L-1] Volume density is equivalent to the volume fraction.
