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TroyBenites t1_j6mayiq wrote

I mean, I guess it is reminessence of the thermometers.

Hot things expand, so it will go up.

If you put a thermometers upside down, I can't recall if geavity interfeers, but I guess. If you look at boiling water on a pan, the water rises...

I think those are a few of the reasons why the direction is upwards. Not totally arbitrary. But I don't know

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AxialGem t1_j6md7h5 wrote

That answer calls up another question.
Why do you view larger numbers as 'up?'
Because OP's thought said nothing about up or down of course, and there's nothing stopping you from making a thermometer where numbers that are physically higher on the thermometer are smaller numbers

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