3. A tube of radius R = 2mm is placed in pool of liquid mercury . When the tube is open to air at the top the capillary forces pull the mercury down
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3. A tube of radius R = 2mm is placed in pool of liquid mercury . When the tube is open to air at the top the capillary
forces pull the mercury down to a depth d . (a) Find d? If the tube top is then closed and the vapor gage pressure, Pg, r,
reduced to - 1.75 kPa, the mercury is pulled up to a heighth . (b) what is h ? ;
(c) for both cases sketch the curvature of the liquid-vapor interface.
For mercury take : 0 = 130%, o = 0.5 N/m, and SG = 13.6.
Approx Ans: (a) d= 3 mm ; (b) h = 8 mm ; (c) both concave down.

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