Curved Interfaces Laplaces Formula

There is a pressure discontinuity across a curved interface. Consider the example of an oil droplet (O) in water (W) (Fig. 1.4a). The droplet is spherical, so as to reduce its surface energy. Letting R be the radius, and displacing the 0/W interface through dii, the work done by capillary forces and pressure is given by  

Laplace s formula gives the jump in pressure across a general curved interface  

Soap bubbles are like blown-up balloons, and when a bubble or a stretched balloon is pricked with a needle, it explodes this is the end of the bubble. 

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