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constant
A quality of a measurement that never changes in magnitude; for example, gravitational forces on earth or another planet is constant and does not change.
This entry is located in the following unit:
Measurements and Mathematics Terms
(page 5)
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“constant”
Avogadro's number, Avogadro's constant
The number of carbon atoms in twelve grams of the carbon-12 isotope.
The relative atomic mass of any element, expressed in grams, contains this number of atoms.
It is named for an Italian physicist Amedeo Avogadro (1776-1856).
This entry is located in the following unit:
Measurements and Mathematics Terms
(page 2)