Source:http://linkedlifedata.com/resource/umls/id/C0021791
MSH: A system of physical units in which the fundamental quantities are length, time, mass, electric current, temperature, luminous intensity, and amount of substance, and the corresponding units are the meter, second, kilogram, ampere, kelvin, candela, and mole. The system has been given official status and recommended for universal use by the General Conference on Weights and Measures.,NCI: The International System of Units (Systeme International d'Unites, SI) is a decimal system of weights and measures derived from and extending the metric system of units established through the Treaty of the Meter (Convention du Metre) signed in Paris in 1875 and currently signed by 48 nations including all the major industrialized countries. The SI is maintained by the International Bureau of Weights and Measures (BIPM, for Bureau International des Poids et Mesures), and is updated every few years by an international conference, the General Conference on Weights and Measures (CGPM, for Conference Generale des Poids et Me