surface tension

Question

Surface tension has SI units of:

RankGuru · Accepted Answer

Surface Tension ($T$ or $S$) is the tendency of liquid surfaces to shrink into the minimum surface area possible. 
1. **Force Perspective**: It is the force acting per unit length along an imaginary line on the surface: $T = F / l$. Unit: **N/m**.
2. **Energy Perspective**: It is the work done (potential energy) per unit area to increase the surface: $T = W / \Delta A$. Unit: $J/m^2$. 
Since $1 J = 1 N \cdot m$, $J/m^2 = N/m$.

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