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> I still don't know if 120F would burn my hands or not, if 150 F scalds or not. I have no sense about temperatures above 100F

I don't see how C would be easier for that. How do you know if 49℃ burns or 66℃ scalds?

My gut sense is that is that over 50C you are getting into scalding territory.

50, which is halfway between 0 and 100, so that, too, kind of makes sense.