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A mole is one of the seven SI base units. It is defined as the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon-12. When the mole is used, the elementary entities must be specified. Entities may be:
See also chemistry and physics
Put more colloquially, the mole is a convenient way of counting large numbers of particles. The number defined above ("as many elmentary entities . . . ") is known as [Avogadros Number]?, and is approximately 6.02 x 1023. If you are dealing with this many atoms or eggs or artichoke hearts, then you have a mole of atoms or eggs or artichoke hearts. If you have half this number of such entities, then you have half a mole of such entities.