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A ratio is the relative size of two quantities expressed as the quotient of one divided by the other. The numbers in a ratio may be quantities or measurements of any kind, such as counts, lengths, weights, or concentrations, for example. When two quantities are measured with the same unit, as is often the case, their ratio is a dimensionless number.

Atom ratio of dissolved O isotopes in NITRATE expressed in conventional DELTA notation referenced to {VSMOW}, samples may or may not have been filtered