Degree Gay-Lussac

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The degree Gay-Lussac ( unit symbol : ° GL , GL ), named after the French physical chemist Joseph Louis Gay-Lussac , was mainly in France used unit for determining the alcohol content . The unit is based on the 100-part hydrometer designed by Gay-Lussac .

The specification in degrees Gay-Lussac corresponds to the volume percentages customary today , i.e. that is, it denotes the volume fraction of the alcohol, but with a negligible inaccuracy. Gay-Lussac used 15 ° C as the reference temperature, whereas today it is measured at 20 ° C. It was also almost identical to the unit used in Germany for determining the alcohol content, the degree Tralles , which corresponds to:

1 ° GL = 1.03 ° Tralles ≈ 1% by volume.

0 ° GL = pure water
50 ° GL = 50% by volume
100 ° GL = pure alcohol

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  • Notifications from the Imperial Standard Calibration Commission. Springer Verlag, Berlin 1912, p. 119.
  • Peter Kurzweil: The Vieweg unit lexicon. Vieweg, Braunschweig / Wiesbaden 2000, ISBN 3-528-06987-2 .