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Système International dâUnités. Internationally agreed coherent system of units: distance in metre (m), mass in kilogram (kg), time in second (s), current strength in ampere (A), temperature in kelvin (K), quantity of a substance in mole (mol) and strength of light in candela (cd) etc.
a substance that improves the efficiency of a catalyst is called a promoter.
the process by which nitrogen passes through the ecosystem.