1、Activity coefficient Number expressing the ratio of a substance's chemical activity to its molar concentration.
2、The molar concentration of a solution, usually expressed as the number of moles of solute per liter of solution.
3、Rough calculations obtained by use of molar concentrations rather than activities are sufficient.
4、Polymers are unusual solutes in that they take up relatively large volumes for nominally low molar concentrations thus influencing the behaviour of polymer solutions.
