mol
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Refers to Moles, which are the SI units of amount of substance, equal to the quantity containing as many elementary units as there are atoms in 0.012 kg of carbon-12.
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H+
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Refers to ions of hydrogen
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e
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An indicator for equivalence. Although many substances contribute to the acidity of the air, the amount of each acidifying substance in the air is scaled by an equivalence factor so that a single value can be reported.
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