Question:medium

Surface tension (T) of a liquid is equal to the work (W) required to increase the surface area ($\Delta A$) of the liquid film by unity at constant temperature. If the volume of a big drop is $27 \times$ the volume of a small drop, the change in surface energy is:

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When $n$ small drops coalesce into one big drop, surface area decreases and energy is released.
Updated On: Apr 8, 2026
  • $2\pi D^{2}T$
  • $4\pi D^{2}T$
  • $\pi D^{2}T$
  • $8\pi D^{2}T$
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The Correct Option is A

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