alleryExcess pressure inside spherical drop of radius r (surface tension γ):
A4γ/r
Bγr
C2γ/r
Dγ/r
Answer & Solution
Correct answer: C. 2γ/r
**For liquid drop:** ΔP = 2γ/r (one surface).
**For soap bubble (two surfaces):** ΔP = 4γ/r.
Smaller drops → higher internal pressure
→ fast evaporation/coalescence.
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