Question

SI unit of surface tension is:

• A. $N{m}^{-1}$
• B. $N{m}^{-2}$
• C. $Nm$
• D. $N{m}^2$

Answer 1

The correct option is A $N{m}^{-1}$

Surface tension has the dimension of force per unit length.

SI unit of force is Newton (N).
SI unit of length is metre (m).

Hence, it SI unit is: $N{m}^{-1}$