Determine the distance $($h$)$ in mm $,$that a column of mercury in the tube will be depressed when the tube is inserted into the mercury at a room temperature of $20\backslash$deg C$.$ Set $($ D$=6)$ mm $,$ density of mercury $=13550$ Kg$/$m$3,($s$)$ surface tension $37\mathrm{.}5$x$10-2$ N$/$m $,$ a$=25$ o$1-$ The Value of theata is equal to $.....?$

The value of h is equal to $.......?$