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The Epic Interactive Encyclopedia 1998
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Epic Interactive Encyclopedia, The - 1998 Edition (1998)(Epic Marketing).iso
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Hare's_apparatus
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1992-09-02
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In physics, a specific kind of hydrometer
used to compare the relative densities of two
liquids, or to find the density of one if the
other is known. It was invented by US chemist
Robert Hare (1781-1858). It consists of a
vertical E-shaped glass tube, with the long
limbs dipping into the two liquids and a tap
on the short limb. Operating the tap removes
air, pushing the liquids up the tubes by
atmospheric pressure. When the tap is closed,
the heights of the liquids are inversely
proportional to their relative densities. If
a liquid of relative density d1 rises to a
height h1, and liquid d2 rises to h2, d1/d2 =
h2/h1.