Twaddell

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A scale used for the measurement of the specific gravity of liquids by hydrometry. The following formula expresses the relationship between specific gravity (SG), and degrees Twaddell (Tw), for liquids heavier than water:

Tw = 200 (SG – 1).

The formula is only exact for comparisons at 15°C.

Textile Resource (http://www.textile.org.uk)

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