A hydrometer is a device used to measure the density of a liquid. It is a cylind

Question

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 floats 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 floats indicates whether the liquid is battery acid (more dense) or antifreeze (less dense). The hydrometer has a weight ofW = 7.72

Explanation / Answer

we know that the density is = mass/ volume here given weight and the density(rho) , and area of cross section

mark willbe the lenght that is l= W/Ag rho

for battery acid l= 7.72*10^-2/8.53*10^-5*10*1280

                       = 0.070 m

for anti freeze l=7.72*10^-2/8.53*10^-5*10*1073

                      = 0.084 m

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