A soap bubble of radius 1 cm expands into a bubble of radius 2 cm. Cal – InterviewSolution

1.

A soap bubble of radius 1 cm expands into a bubble of radius 2 cm. Calculate the increase in surface energy if the surface tension for soap is 25 dyne/cm.

Answer»

Surface energy per unit area is equal to surface tension.

E = increase in surface area × ST

= 4π (22 – 1²) × 2.5

= 4π × 3 × 2.5

= 1.02 × 10³ erg

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