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Hare's apparatus  Hare's apparatus is used to compare the density of two liquids. When air is removed from the top of the apparatus, the liquids rise in the tubes to heights which are inversely proportional to their densities. | 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 an E-shaped glass tube, with the long limbs dipping into the two liquids and a tap on the short limb. With the tap open, air is pumped out of the apparatus and the liquids are pushed up the long limbs by atmospheric pressure. When the tap is closed, the heights of the liquids are inversely proportional to their relative densities. That is, if a liquid of relative density d1 rises to a height h1, and liquid d2 rises to h2, then d1/d2 = h2/h1. |
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