A gas bubble of radius 1 cm rises at a constant rate of 3 mm/s through a solution of density 4.16 g/cm""^(3). Determine the coefficient of viscosity of the solution. Neglect the density of the gas.

A gas bubble of radius 1 cm rises at a constant rate of 3 mm/s through

1.	A gas bubble of radius 1 cm rises at a constant rate of 3 mm/s through a solution of density 4.16 g/cm""^(3). Determine the coefficient of viscosity of the solution. Neglect the density of the gas.
Answer» Solution :Given, r=1 cm, v=-3 mm/s =-0.3 cm/s (TAKING downward direction as positive) Terminal velocity is given by) `v=2/9 r^(2)/ETA (p-p.)g` `rArr eta=2/9 r^(2)/v (p-p.) g` `=(2 xx (1)^(2) xx (0-2.15) xx 980)/(9 xx (-0.3))` =1560.74 poise