In chemistry, the amount of substance (symbol n) in a given sample of matter is defined as a ratio (n = N/NA) between the number of elementary entities...

called molarity, amount concentration or substance concentration) is a measure of the concentration of a chemical species, in particular, of a solute in a...

the ratio between the amount of a constituent substance, ni (expressed in unit of moles, symbol mol), and the total amount of all constituents in a mixture...

unit of measurement, the base unit in the International System of Units (SI) for amount of substance, a quantity proportional to the number of elementary...

air and alloys. The mole is a unit of measurement that denotes an amount of substance (also called chemical amount). One mole is defined to contain exactly...

molar mass (M) of a chemical compound is defined as the ratio between the mass and the amount of substance (measured in moles) of any sample of the compound...

to the Boltzmann constant, expressed in units of energy per temperature increment per amount of substance, rather than energy per temperature increment...

mole (mol, amount of substance), and candela (cd, luminous intensity). The system can accommodate coherent units for an unlimited number of additional...

for amount of substance, and the candela for luminous intensity. The SI base units are a fundamental part of modern metrology, and thus part of the foundation...

{\displaystyle {\tilde {V}}} of a substance is the ratio of the volume occupied by a substance to the amount of substance, usually at a given temperature...

(symbol c) of a substance is the amount of heat that must be added to one unit of mass of the substance in order to cause an increase of one unit in...

ions) per mole (SI unit) and used as a normalization factor in the amount of substance in a sample. The constant is named after the physicist and chemist...

the IPK. Unlike the units relating to mass, energy, temperature, amount of substance, and electromagnetism, the optical units were not massively redefined...

02 where c(H+) denotes the amount-of-substance concentration of hydrogen ion H+ and y1 denotes the activity coefficient of a typical uni-univalent electrolyte...

substance which scientists could not decompose into simpler substances by experimentation. This brought an end to the ancient idea of the elements of...

are the simple measurements for time, length, mass, temperature, amount of substance, electric current and light intensity. Derived units are constructed...

depends on the amount of substance. The related intensive quantity is the density which is independent of the amount. The density of water is approximately...

chemical substance is a unique form of matter with constant chemical composition and characteristic properties. Chemical substances may take the form of a single...

volume and temperature respectively; n {\displaystyle n} is the amount of substance; and R {\displaystyle R} is the ideal gas constant. It can also be...

length (L), mass (M), electric current (I), absolute temperature (Θ), amount of substance (N) and luminous intensity (J). The symbols are by convention usually...

specific quantity of the substance to change its state from a solid to a liquid, at constant pressure. The enthalpy of fusion is the amount of energy required...

access to the value of the amount of substance. (See also Molar mass.) If specific molar values are given, then the amount of substance of a given sample may...

divide the amount of charge (the current integrated over time) by the Faraday constant in order to find the chemical amount of a substance (in moles)...

initial amount of active substance — substance that has the same percentage of unstable particles as when the substance was formed. The mathematics of radioactive...

often Eq) is the amount of a substance that reacts with (or is equivalent to) an arbitrary amount (typically one mole) of another substance in a given chemical...

corresponding quantity relative to the amount of substance with unit J/mol is the molar internal energy. The internal energy of a system depends on its entropy...

the diffusion flux, of which the dimension is the amount of substance per unit area per unit time. J measures the amount of substance that will flow through...

of a liquefied and cryogenic substance is the volume of a given amount of that substance in liquid form compared to the volume of the same amount of substance...

definition: The mole is the amount of substance of a system that contains as many elementary entities as there are atoms in 0.012 kilogram of carbon-12. When the...

well-defined amount of substance, the specific heat is the measure of the heat required to increase the temperature of such a unit quantity by one unit of temperature...