A hydrometer is an instrument used to determine liquid density. A simple one is

Question

A hydrometer is an instrument used to determine liquid density. A simple one is sketched in the figure below. The bulb of a syringe is squeezed and released to let the atmosphere lift a sample of the liquid of interest into a tube containing a calibrated rod of known density. The rod, of length L and average density ?0, floats partially immersed in the liquid of density ?. A length h of the rod protrudes above the surface of the liquid. Show that the density of the liquid is given by

? = ?0L L ? h

(Do this on paper.)

Explanation / Answer

use this formula

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