The meter, kilogram, and second remain the basis of the modern metric system from "summary" of The Measure of All Things by Ken Alder
The meter, kilogram, and second have endured as the foundation of the contemporary metric system, standing the test of time as the essential units of measurement. These units serve as the core building blocks upon which the entire system is constructed, providing a standardized framework for quantifying various physical quantities. With their origins dating back to the late 18th century, these fundamental units have evolved and adapted over the years, yet their fundamental significance remains unchanged. The meter, originally defined as one ten-millionth of the distance from the equator to the North Pole, has since been redefined in terms of the speed of light. This revision has allowed for a more precise and universal definition of the unit, ensuring consistency and accuracy across different scientific disciplines. Similarly, the kilogram, originally based on a platinum-iridium artifact, has been redefined in terms of fundamental constants of nature, eliminating the dependence on a physical prototype susceptible t...
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