n :  either of two hydrometer scales that indicate specific gravity in arbitrarily defined but constant degrees  a  :  one for liquids lighter than water on which specific gravity S at 60°F (15.6°C) is related to the Baumé reading n in degrees by S = 140 ÷ (130 + n)  b  :  one for liquids heavier than water on which specific gravity S at 60°F (15.6°C) is related to the Baumé reading n in degrees by S = 145 ÷ (145 - n) .
 
 
 
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