# Resolve RDF Terms

quantitykind:RelativeMassExcess
http://qudt.org/vocab/quantitykind/RelativeMassExcess

### Recommended prefix

quantitykind:

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Relative Mass Excess
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http://en.wikipedia.org/wiki/Mass_excess
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http://www.iso.org/iso/catalogue_detail?csnumber=31895
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$$\Delta_r = \frac{\Delta}{m_u}$$, where $$\Delta$$ is the mass excess and $$m_u$$ is the unified atomic mass constant.
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$$\Delta_r$$
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The "Relative Mass Excess" is the mass excess between the monoisotopic mass of an element and the mass of its A + 1 or its A + 2 isotopic cluster (extrapolated from relative mass defect).