Question

the surface tension of water is 72 cm^-1 Express it as a unit

Answer 1

C.G.S=Dyne/cm
S.I=N/m
1 dyne=10^-5 N
1cm =10^-2 m
1 dyne/cm=10^(-5+2) N/m=10^-3 N/m
72 dynes/cm=72×10^-3 N/m
=72/1000 N/m
=0.072 N/m