Question

explain standard units. what is standard unit of length

Answer 1

the unit whose value is same in all over the world is called standard unit or the value is mostly used by all the countries to measure the mass or another things standard unit of length is metre .
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Answer 2

Standard Units are give a body which governs the laws and provides accurate information. Internationally it is Système International d'Unités(SI) which is also known as Internati9nal System of Units and this body is governed by Conférence Générale des Poids et Mesures (CGPM) which is also known as General Conference on Weights and Measures .