Had different periods, so any such a definition would have to specify a location It was already known that identical pendulums set up in different places Pendulum's period is the time it takes to make one complete swing back andДЇorth). Length be defined as the length of a pendulum with a period of 2 seconds. Jean Picard, Olaus RГёmer and other astronomers had suggested that a unit of There was also a feeling,Д¬onsonant with the Rousseauistic spirit of the times, that units should be, Persuasions were calling for metrological reform. Long before the French Revolution, persons of all political Industrializing economy and the capabilities of its system of weights and No other nation suffered from such a disparity between the demands of an Mess, with dozens of units, each with dozens or even hundreds of local values. In the 1780s, French weights and measures were a Indicates the distance between the points! History of the meter

Travel between two points in a vacuum no longer indicates the speed of light it A measurement of the time it takes light to

This definition of the meter makes the length of the meter depend on theДuration of the second by definition the speed of light is now exactlyДў99,792,458 meters per second. Light travels in a vacuum in exactly 1вЃ„299,792,458th of a second (17th Since 1983 the meter has been defined as the distance The unit of length in SI, one of the seven base units.

Meter definition