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There's an important point that seems to have been missed here: it was initially proposed that the metre would be the length of a pendulum whose period would be equal to one second. when let swing at the surface of Earth. Unfortunately, it was realised only too late that in fact because acceleration due to gravity varies slightly depending on where you stand ...


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It will be very difficult to trace who came up with the concept of matter. Why don't you start with the concept of atom for educational purposes. This idea is well researched. The unabridged Oxford Dictionary (subscription based) traces the word origin of matter as Etymology: < Anglo-Norman matier, matere, matire, mateire, Old French matere, matiere (...


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