# The sap in trees, which consists mainly of water in summer, rises in a system of capillaries of radius . The surface tension of sap is and the angle of contact is . Does surface tension alone account for the supply of water to the top of all tress?

r = radius of the capillary

, p = 1000 kg/m3

now, $h =\frac{2 s \cos \theta}{rpg} = 2 \times 7.28 \times 10^{-2} \frac{\cos 0}{2.5 \times 10^{-5}\times 1000 \times 9.8}$

$h = \frac{104}{175}\times \frac{1000}{1000} = \frac{104}{175} = 0.594 \approx 0.6m$

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