If it’s 50 degrees Fahrenheit then it’s 20 degrees Celsius. Double that and it’s 100F, and only 37C.
10C doubled to 20C is 50F and 68F.
On nice spring days I’ve always said “wow, it’s almost twice as hot today as it was last week.” But I don’t think that’s even remotely accurate.
Is Kelvin the only way to accurately measure something like this? If so, 300K is 80.33F and if you were to double it, you get 600K and 620.33F.
Would we ever be able to say “It’s twice as hot today as X time in the past?”
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“it is twice as hot as last week” is a figure of speech not a scientific statement.
While it might be in some cases a literal statement; like it was 10 degrees Celsius and now 20 degrees Celsius or 20/40 farenheit something. It is (usually) just used to indicate that the weather has changed a lot in a relatively short span of time.
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