The pressure inside a mercury drop of diameter 2 mm is (Surface tension of mercury $= 0.5 Nm^{-1}$ and atmospheric pressure $= 10^5$ Pa)
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Drop vs Bubble:
- Liquid Drop (in air): 1 Surface $\rightarrow \Delta P = 2T/R$
- Soap Bubble (in air): 2 Surfaces $\rightarrow \Delta P = 4T/R$
- Air Bubble (in liquid): 1 Surface $\rightarrow \Delta P = 2T/R$