- #1
Amr719
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Homework Statement
By How much does the pressure in a cylinderical jet of water 4mm in diameter exceed the pressure of the surrounding atmosphere if the surface tension of water is 0.0718 N/M?
Homework Equations
The Attempt at a Solution
ΔP= σ/r=0.0718/2*10^-3 , This is the answer I have but I don't understand from where did he get this law . Isn't it supposed to be ΔP= 2σ/r instead ?[/B]