Question -
Answer -
Angle of contact between mercury and soda lime glass, θ =140°
Radius of the narrow tube, r = 1 mm = 1 × 10–3 m
Surface tension of mercury at the given temperature, s =0.465 N m–1
Density of mercury, ρ =13.6 × 103 kg/m3
Dip in the height of mercury = h
Acceleration due to gravity, g = 9.8 m/s2
Surface tension is related with the angle of contact and the dipin the height as:
Here, the negative sign shows the decreasing level of mercury.Hence, the mercury level dips by 5.34 mm.