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Nissan develops paint that keeps cars cool in summer heat
(www.asahi.com)
This is a most excellent place for technology news and articles.
And that’s 12 degrees Celsius (21.6 degrees Fahrenheit)! What kind of garbage article doesn’t include the units!?
Why would it be anything else?
It's clearly too low a number to be °K. And since the only two valid units of measurement for temperature are Kelvin and Celsius, it must be °C.
A differential temperature of 12C is equal to a differential temperature of 12K….. You don’t take the offset into account for differential temperatures.