Question

Calculate the density of paraffin oil, if within a glass capillary of diameter 0.25 mm dipped in paraffin oil of surface tension 0.0245 N/m, the oil rises to a height of 4 cm. [Angle of contact of paraffin oil with glass = 28°, acceleration due to gravity = 9.8 m/s²]

Answer 1

Data : d = 0.25 mm, T = 0.0245 N/m, h = 4 cm

= 4 × 10^-2m, θ = 28°, g = 9.8 m/s²

This gives the density of paraffan oil.