In an open-Utube, the pressure of a water column on one side is balanced by the pressure of a column of petrol on the other side. Compared to the height of the water column, the petrol column will have: (a) a higher
(b) a lower, or
(c ) the same height. Why ? If the height of water column is 15 cm, what is the height of the petrol column? density of petrol`=0.68(g)/(cm^3)`.

Explanation

Petrol column has a higher height because petrol has lower density than the density of water
`h_p=(h_wrho_w)/(rho_P)=(15cm)((1)/(0.68))`
`=22cm`