Angle of contact θ = 140°
Radius of the tube, r = 1 mm = 10-3m
Surface tepsion of mercury S = 0.465 N/m
Density of mercury, ρ = 13.6 × 103 kg/m3
g = 9.8 m/s2
Let the Dip in height of mercury be h Surface tension is given by,
Negative sign indicates that mercury level, dips by 5.34 mm.