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Fig. 28.—A hydrometer used to find the density of a liquid.

Density of Liquids by Loss of Weight. Weigh a piece of glass in air (Wa), in water (Ww), and in the liquid to be tested (Wl).

Then (Wa - Ww)gives the weight of the water displaced.

And (Wa - Wl) gives the weight of the liquid displaced.

Hence, (Wa - Wl)/(Wa - Ww) equals the specific gravity of the liquid.