A hydrometer is a device used to measure the density of a
Chapter , Problem 42(choose chapter or problem)
A hydrometer is a device used to measure the density of a liquid. It is a cylindrical tube weighted at one end, so that it fl oats with the heavier end downward. The tube is contained inside a large medicine dropper, into which the liquid is drawn using the squeeze bulb (see the drawing). For use with your car, marks are put on the tube so that the level at which it fl oats indicates whether the liquid is battery acid (more dense) or antifreeze (less dense). The hydrometer has a weight of W 5 5.88 3 1022 N and a crosssectional area of A 5 7.85 3 1025 m2 . How far from the bottom of the tube should the mark be put that denotes (a) battery acid (r 5 1280 kg/m3 ) and (b) antifreeze (r 5 1073 kg/m3 )?
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