Excess of pressure on curved surface of liquid.

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Excess of pressure on curved surface of a liquid.
We know that the similar molecules of a liquid attract each other by a force of cohesion and force of surface tension acts tangentially to the liquid surface at rest.
If a liquid surface is plane, the molecule O on the liquid surface is acted upon by the forces of surface tension, tangentially to the liquid surface in opposite directions. Thus the resultant force on the molecule of a liquid surface would be zero.
If a liquid surface is curved, the molecule O, on the liquid surface is acted upon, by the forces due to surface tension, along the tangent to the surface.
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