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    Bernoulli's Theorem

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    On a bet, you try to remove ethyl alcohol from a glass by blowing across the top of a vertical straw immersed in the ethyl alcohol. What is the minimum speed you must give the air at the top of the straw to draw ethyl alcohol upward through a height of 1.7 cm?

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    Solution Preview

    Bernoulli's theorem : For streamline flow of a perfect liquid, the sum of pressure energy, potential energy and the kinetic energy per unit mass is constant throughout the flow. This can be expressed by the following equation :

    P/ρ + gh + ½ v2 = Constant ....(1)

    Alternative forms of the above equation are :

    Multiplying (1) by ρ we get : P + ρgh + ½ ρv2 = Constant ......(2)

    Dividing (1) by g we get : P/ρg + h + ½ (v2)/g= Constant ....(3)


    Solution Summary

    The expert examines Bernoulli's Theorem for ethyl alcohol.