Question

Surface tension of water in the CGS cm is 72 dyme/cm . What is its velue in SI units ?

Answer 1

Answer:

surface tension = 72 dyne/cm

1 dyne = 10^-5 N and 1 cm = 10^-2 m

so surface tension = 72× 10^-5 × 10^2

= 72×10^-3 N/m

Answer 2

The value of Surface tension of water in SI units is 72 × 10⁻³ N/m

- It is given that surface tension of water in CGS system = 72 dyne/cm

- We know that

1 dyne = 10⁻⁵ N

1 cm = 10⁻² m

- Thus,  surface tension in SI units

S = (72 × 10⁻⁵) / 10⁻² N/m

S = 72 × 10⁻⁵ × 10² N/m

S = 72 × 10⁻³ N/m

S = 0.072 N/m