Find the weight of water supported by surface tension in a capillary tube with a radius of 0.2mm. Surface tension of water is 0.072Nm^(-1) and angle of contact of water is 0^(@)

Find the weight of water supported by surface tension in a capillary t

1.	Find the weight of water supported by surface tension in a capillary tube with a radius of 0.2mm. Surface tension of water is 0.072Nm^(-1) and angle of contact of water is 0^(@)
Answer» Solution :Assume the weight of WATER to be .F. weight of water in capillary tube = upward force due to surface tension i.e., `F=2pir(Scostheta)` Surface tension of water `S=0.072Nm^(-1)` ANGLE of contact`theta=0^(@)` RADIUS of capillary tube `(r)=(0.2)/(1000)m=0.2xx10^(-3)m` `F=2pir(Scostheta)=2xx(22)/(7)xx0.2xx10^(-3)xx0.072xx1` `=90.51xx10^(-6)NimpliesF=90.51xx10^(-6)N`