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songoku
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The level of this learning material is high - school level
From my note, there are two equations that can be used related to venturimeter:
1. ##P+\rho gh + \frac{1}{2} \rho v^2 = \text{constant}##
2. ##P_1 + \frac{1}{2} \rho {v_1}^2 = P_2 + \frac{1}{2} \rho {v_2}^2##
I want to ask about second equation, how can we get that equation? My teacher said it is also from Bernoulli equation and we just cross out the ##\frac{1}{2} \rho v^2## part but I do not understand why. Don't the liquid have different velocity (##v_1## and ##v_2##) so why we can cross that part?
Thanks