The metric system came about during the time of the French Revolution, during the age of Rationalism etc.
This places it in the later part of the 1700's, which is the 18th century.
A good resource for this is the book "The measure of all things" by Ken Alder
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The metric system is a system of units for measurement developed in late 18th century in France.It was developed by the chemist Lavoisier to replace the disparate systems of measures then in use with a unified, natural and universal system. In the early metric system there were several fundamental or base units, the meter for length, the gram for weight and the liter for capacity.
The english system is the metric system. There is no difference.
In the metric system, lengths are calculated in meters.In the metric system, lengths are calculated in meters.In the metric system, lengths are calculated in meters.In the metric system, lengths are calculated in meters.
Meter as a unit of length was not invented but introduced in accordance with international convention, in 1875. The idea of introducing the metric system originated in France in the 18th century.
We learned the metric system in math today.