Techniques that use the Laplace equation to measure surface energy

1 Techniques that use the Laplace equation to measure surface energy 

In Chapter 2 the capillary-rise technique for measuring yuv was described. A number of other techniques, which are based on the Laplace 

If a capillary tube is inserted to a depth h below the surface of a liquid the hydrostatic pressure will be pgh. If an inert gas is blown through the tube the pressure in the resultant bubble will be given from Equation (6.13) as 

The maximum pressure will obtain for the minimum value of r, which corresponds to the point when the bubble is hemispheric in shape and r will be the radius of the tube. Measurement of the maximum value of P 

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