The heights of the liquids vary inversely as the densities
Example. If one of the beakers in Figure 25 contains sulfuric acid and the other contains water, and if the height of the column of water is 40 cm when the height of the column of acid is 30 cm, find the density of the sulfuric acid.
Density of acid height of water
–––––––––––––– = –––––––––––
Density of water height of acid ,
d2 h1 40
–– = ––– = –––
d1 h2 30 ,
d2 = 1.33 g per cu cm density of acid
A Hydraulic Press. - A hydraulic press consists of a strong cylinder (Figure 26) in which works a cylindrical piston C. By means of a small pump D oil is forced into the large cylinder through a check valve K, which prevents its return.
Figure 26 - The hydraulic press produces large forces.