Surface Tension Of Raindrops

Small raindrops are actually perfectly spherical. The pressure difference between the inside and outside of a spherical raindrop of volume 4.2×109 m34.2 \times 10^{-9}~\mbox{m}^3 is 280 Pa280~\mbox{Pa}. What is the surface tension in N/m of the water on the outside of the raindrop?

Image credit: Samantha Krieger
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