Why is some speed (e.g. wind) expressed in “knots” and what does “1 knot” even mean logicslly?
In: 20
Because sailboats and [nautical miles](https://en.wikipedia.org/wiki/Nautical_mile).
To measure their speed, sailors would traditionally tie knots in a piece of rope and let it out the back of the boat. They would then count the number of knots that passed through their hand as the rope was pulled backwards relative to their motion.
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