(ii)A liquid of density rho and surface tension S rises to a height h in a capillary tube of diameter D. What is the weight of the liquid in the capillary tube? Angel of contact is 0^@.

(ii)A liquid of density rho and surface tension S rises to a height h

1.	(ii)A liquid of density rho and surface tension S rises to a height h in a capillary tube of diameter D. What is the weight of the liquid in the capillary tube? Angel of contact is 0^@.
Answer» Solution :RISE of liquid in the capillary tube is given as, `H=(2Scostheta)/(rho r g) ` Here, `r=(D)/(2). Theta=0^@., cos0^@=1` So, `h=(2Sxx1)/(rhoxxD/2xxg)=(4S)/(rho DG)` Now, weight of liquid in the capillary tube, W = mass `xx` = m (volume `xx` DENSITY )`xx`g `=(pir^2xxh)xxrhoxxg` `=pi(D^2)/(4)xx((4S)/(rhoD g))xxrhoxxg=piDS` This is the required result.