Question

The surface tension of water is 72 dyne//cm. Express is in SI units.

Answer 1

Correct Answer - 0.072 N//m
Surface tension, `sigma = (F)/(I) = [M^1 L^0T^(-2)]`
Here, `n_1 = 72, M_1 = 1g, T_1 = 1s`
`n_2 =?, M_2 =1kg, T_2 =1s`
`n_2 = n_1((M_1)/(M_2))^1((T_1)/(T_2))^(-2) = 72 ((1g)/(1kg))^1((1s)/(1s))^(-2)`
`=72xx10^(-3) =0.072N//,`