Question

Q.28 Define surface tension of liquid. Hence obtain>the unit and dimensions of surface tension. How>much work is required to form a bubble of radius>5 cm from the soap solution having surface>tension 30 dyne/cm.​

Answer 1

SURFACE TENSION:

• It is an inherent property of liquid surfaces (which are at rest) to spread over a minimum surface area as possible.

• Surface area = F/L , so it's SI unit is Newton/Metre.

• Dimensions is: $ML^{0}T^{-2}$

Work done = Surface Tension × Area

=> Work = 30 × (4πr²)

=> Work = 30 × 4π × 5²

=> Work = 300π

=> Work = 942.4 Erg

Hope It Helps.