Ncert Exercises & Solutions

Q. 16 The sap in trees, which consists mainly of water in summer, rises in a system of capillaries of radius r = 2.5 $\times 10^{- 5} m .$ The surface tension of sap is T=7.28 $\times 10^{- 2} N m^{- 1}$ and the angle of contact is $0 °$ . Does surface tension alone account for the supply of water to the top of all trees?