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# Mole

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(Not to be confused with "mole" the mexican food dish, or the rodent.)

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:

- atoms
- molecules
- ions
- electrons
- other particles
- specified groups of such particles

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.

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Last edited August 15, 2001 11:16 pm (diff)
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