Concentration

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Concentration

Description

Concentration {quote}:

1. Group of four quantities characterizing the composition of a mixture with respect to the volume of the mixture (mass, amount, volume and number concentration).

2. Short form for amount (of substance) concentration (substance concentration in clinical chemistry).

{end of quote: IUPAC Gold Book}

Abbreviation: c

Reference: IUPAC Gold Book

Total concentration

1. The total concentration of a substance (e.g. ADP) must be distinguished from the concentration of a specific ionic species (e.g. ADP^4-, MgADP^2-, MgHADP^-).
2. The total concentration of a substance must be distinguished from the free concentration, if unspecific binding occurs to membranes (e.g. TPP) or if a substance is bound to BSA (e.g. fatty acids).
3. The concentration of a substance (c) differs from the activity (a), except at very high dilution. The activity of dissolved gases is expressed as the (relative) partial pressure (e.g. p_O2). The ratio of concentration (e.g. c_O2 [µM]) and partial pressure (e.g. p_O2 [kPa]) is the solubility (see oxygen solubility).

MitoPedia concepts: MiP concept, Ergodynamics