Gay-Lussac hydrometer scale

A hydrometer scale calibrated so that readings are the percentage of ethanol (ethyl alcohol) by volume. Zero on the scale is the level to which the instrument sinks in pure water at 15°C, and 100 is the level to which it sinks in pure ethanol at 15°C. It differs from Tralles' scale only in the temperature at which the set points are defined. It was used in France.

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