Question

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

Answer 1

1 dyne = 10⁻⁵ N
1 cm = 10⁻² m
\[\therefore 72 \text{ dyne /cm }= \frac{72 \times {10}^{- 5} N}{{10}^{- 2} m} = 72 \times {10}^{- 3} N/m = 0 . 072 N/m\]