in bernoulli's equation at point 1 the pressure is positive (saying that is applied by the water), but at point 2 with the same condition pressure is negative (pressure is applied by the atmosphere......why is it so? At point 2 the pressure should also be positive....

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in bernoulli's equation at point 1 the pressure is positive (saying that is applied by the water), but at point 2 with the same condition pressure is negative (pressure is applied by the atmosphere......why is it so? At point 2 the pressure should also be positive....

Physics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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The positive and the negative signs indicate whether the pressure is assisting the the movement of the fluid (i.e. either helping to change it P.E or K.E) . For eg while using a pump, the pump will apply positive pressure and increase the fluid's kinetic energy while at the other end the atmospheric pressure will oppose the movement of water and will be termed as negative pressure.In deriving the equation, at one end we force the water to move by applying the pressure ( the means are unimportant ) while the other end is left open to the atmosphere or any other situation. Obviousy the pressure will oppose the motion and the work done by it will be negative and you must have seen while deriving the eqn.
wow! Thank you very much Diwakar....

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