Question

The surface tension of water is 72 dyne/cm. Convert it in SI unit.

Answer 1

Surface tension of water = 72 dyne/ cm

We know that,

$1Dyne={10}^{-5}N$ and $1cm={10}^{-2}m$

Therefore, 72 dyne/cm $=\frac{72\times {10}^{-5}}{{10}^{-2}}$ N/m

$=72\times {10}^{-3}$ N/m

$=0.072$ N/m.