# Amount of substance (material quantity)

The amount of substance (material quantity) is a measure of the size of an ensemble of identical particles, such as atoms, molecules, electrons, and other particles. It is related to the number of particles in the ensemble, but is a distinct concept, because it is a measure of the number of particles of a given type, rather than the total number of particles.

The SI unit of amount of substance is the mole (abbreviated mol), which is defined as the amount of a substance that contains as many elementary entities as there are atoms in 0.012 kilogram of carbon-12. This number is called Avogadro's number, and has the value 6.022×10^23. Is amount of substance a base quantity? No, amount of substance is not a base quantity. The SI unit for amount of substance is the mole, and amount of substance is not included in the list of seven base SI units. Is the amount of material in a substance? The answer to this question is somewhat complicated and depends on how you define "material." In general, the amount of material in a substance is the mass of the substance divided by the substance's density. However, this definition is not always accurate, as some substances (such as air) are not very dense. In addition, this definition does not take into account the fact that some substances (such as water) are made up of multiple elements. As a result, a more accurate definition of the amount of material in a substance would be the mass of the substance divided by the average density of the substance's elements. What is the example of amount of substance? The SI unit for amount of substance is the mole. What is the basis of amount of substance? The basis of amount of substance is the Avogadro constant, which is the number of particles in one mole of a substance. The Avogadro constant is used to calculate the amount of substance in a sample based on the number of particles in the sample.

##### What is the instrument used to measure amount of substance?

The instrument used to measure amount of substance is the mole. The mole is a unit of measurement used in chemistry to represent an amount of substance. One mole of a substance is equal to the amount of that substance that contains Avogadro's number of particles (6.02 x 10^23).