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Re: Speed

Posted by Spider-Pig on Tue Apr 23 19:09:13 2019, in response to Re: Speed, posted by Steamdriven on Tue Apr 23 18:55:33 2019.

I agree about Fahrenheit. Temperature is the only one where fractional and multiple units are not used (no centidegrees or kilodegrees), so the usefulness of Celsius is insignificant.

As for the other units, that history is interesting but useless. So I disagree. The derivations of the metric units have their own history behind them. The polar circumference of the Earth is 40,000,000 m or 40,000 km. That’s true everywhere, not just France, and always was true and always will be true. OTOH, a plowed field is a single, forgotten fact about the climate and technology of a particular place at a particular time. Even so, it was still somewhat variable so at some point the furlong has to be defined semi-arbitrarily as ⅛ of a mile, 40 rods, 220 yards, or 660 feet.

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