To convert surface tension from CGS units (dyne/cm) to MKS/SI units (N/m), we apply the standard unit conversion factors : $1\text{ N} = 10^5\text{ dyne} \implies 1\text{ dyne} = 10^{-5}\text{ N}$ $1\text{ m} = 10^2\text{ cm} \implies 1\text{ cm} = 10^{-2}\text{ m}$ Therefore, $70\text{ dyne/cm} = 70 \times \frac{10^{-5}\text{ N}}{10^{-2}\text{ m}} = 70 \times 10^{-3}\text{ N/m} = 7 \times 10^{-2}\text{ N/m}$.