Question

Pub quiz question 339 by pjh2

Question: Q: What measurement was originally defined as "1⁄10,000,000 of the distance from the Earth's equator to the North Pole measured on the circumference through Paris,"in 1791 but was subsequently, and eventually, redefined using the speed of light in 1983?
Answer: A: The metre.
Categories: Physics (1) General Knowledge (2) Science (1)