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?
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)
The expert examines Bernoulli's Theorem for ethyl alcohol.