Question

Surface tension of water in the CGS system is 72 dynes/cm. What is its value multiplied by 1000 in SI units?

Answer 1

SI unit for force would be newton.

1 Newton=100000 dyn

SI unit for length will be meter

1 meter=100 cm

Converting CGS to SI units,

72 dynes/cm will be $72\times {10}^{-5}\times {10}^2=72\times {10}^{-3}N/m$

Multiplied by 1000, it will be $72\times {10}^{-3}\times 1000=72$