Direct measurement of static contact angle by video camera or goniometer

1 Direct measurement of static contact angle by video camera or goniometer 

2 The receding contact angle, Q can be measured when a previously formed sessile drop on the substrate surface is contracted by applying a suction of the drop liquid through 

The inclusion of gravity correction into the Young-Laplace equation is feasible for large sessile liquid drops formed on solids. Determination of what is a large drop and what is small can be performed by simply comparing the contact radius of the sessile drop with 

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