Amount of substance

SI unit of amount of substance

fundamental physical constant (symbols: L, Nᴀ) representing the molar number of entities

physical law that equal volumes of all gases at the same temperature and pressure have the same number of molecules

extensive physical property

history of scientific theory that views matter as made up of atoms of chemical elements

physical constant; the molar equivalent to the Boltzmann constant

measure of the tendency of a solution to take in pure solvent by osmosis

statement that a given chemical compound always contains its elements in fixed ratio (by mass) and does not depend on its source and method of preparation

dimensionless physical quantity: ratio of the average mass of atoms of an element to one unified atomic mass unit

property of solutions that depend upon the ratio of the number of solute particles to the number of solvent molecules in a solution

phenomenon where the boiling point of a liquid is higher when another compound is added

process in which adding a solute to a solvent decreases the freezing point of the solvent

molarity of osmotically active particles

physical constant - number density of molecules in an ideal gas at standard temperature and pressure

in chemistry

relative atomic mass, in samples by standard, as published by IUPAC (CIAAW)

An osmometer is a device for measuring the osmotic strength of a solution, colloid, or compound.

An amagat (denoted amg or Am) is a practical unit of volumetric number density. Although it can be applied to any substance at any conditions, it is defined as the number of ideal gas molecules per unit volume at 1 atm (101.325 kPa) and 0 °C (273.15 K).