If two equal and opposite forces act on a surface, can I say the pressure is zero because the net force is zero? How can pressure be non directional when force as a direction? How can the pressure of a liquid be explained at the molecular level in liquids? If I exert a force vertically on a liquid, why does it move sideways?
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1Please limit the number of questions per post to 1. If you have several questions, ask them individually. – ShankRam Dec 13 '15 at 12:32
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These questions are very elementary. You want a general understanding of fluid statics. Think of a cube of fluid as full of bouncing rubber balls, and the walls are vibrating too (with temperature). That model answers all your questions. – Mike Dunlavey Dec 13 '15 at 13:51
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6Possible duplicate of Define Pressure at A point. Why is it a Scalar? – nluigi Dec 13 '15 at 16:47
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Pressure is force per unit area. Pressure and force are different, though related, units of measurement
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Fluid is a continuum in which we are interested in describing flow properties as continuous function of space ( also time). So pressure will be much better representation than force.
Think about this, dF=p.dA here p is pressure at a point as a function of space and dF, dA are elemental force and elemental area at a point. Give it a thought it will be more clear.
