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I'm confused, because one delta degree Celsius is exactly the same as one delta degree Kelvin. And you can convert with an offset.

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In thermodynamic calculations you likely need absolute (Kelvin) values. But in many calculations where only temperature difference is used, either unit works equally well.

That sounds like a case for Kelvin. I still don't see why Celsius is the one exception that isn't SI.

I'll take a survey tomorrow to see how many people know what kelvin to C conversion is off the top of their head.

The other issue is when you get to Candelas!

How often are you doing the conversion manually? It seems like the sort of thing that should happen in the presentation layer so people never see the actual Kelvin amount. If you have a system where you always use SI then it's strange the have a single exception for temperature.

Hm, is it wrong to dream of a world, where this along with other basic science, would be considered basic knowlege?

Not blaming anyone who does not know it, but I would argue for more and better science education ..

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