Temperature scale named after the German physicist who invented the mercury thermometer (10)

I believe the answer is:

fahrenheit

(Other definitions for fahrenheit that I've seen before include "On which water freezes at 32 deg." , "Measure of warmth" , "Physicist; temperature scale" , "Finer heath (anag.)" , "Man of some scale" .)

I've seen this clue in The Independent.

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