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Originally Posted by P-hack
Lol, it isn't like sea level is that arbitrary, well it is a bit, but not as arbitrary as "lets base it on where james is living", I think on degrees of irrationality, that might win... I mean the sea is over 70% of the earths surface, you can't pretend to be of that sort of significance.
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But "sea level" changes. Twice a day with tides, more gradually as glaciers shrink and grow. And even if we could somehow hold the sea level constant, the atmospheric pressure itself changes due to weather systems in the short term. There's also some evidence for major changes over geologic time.
And of course we now have the option of measuring temperatures on other planets, with robotic probes if not yet in person. So nice job picking a "constant" :-)
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Originally Posted by CapriRacer
...not realizing that small, medium, and large are dimensionless and that doesn't seem to be a problem.
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It is rather a problem - and one reason I hate clothes shopping - if your shoulders are "L" or "XL", but your waist is "S".