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The Avogadro constant, commonly denoted N A [1] or L, [2] is an SI defining constant with an exact value of 6.022 140 76 × 10 23 mol −1 (reciprocal moles). [3] [4] It is this defined number of constituent particles (usually molecules, atoms, ions, or ion pairs—in general, entities) per mole and used as a normalization factor in relating the amount of substance, n(X), in a sample of a ...
In the early 20th century the word gained the additional meaning of describing a disability, in the sense that a person with a handicap was carrying a heavier burden than normal. [69] This concept, then, adds to the conception of disability as a burden, or individual problem, rather than a societal problem. [ 70 ]