Quick true of false question on fluids in motion?

According to Bernoulli's equation, when a tube changes from a large diameter to a small diameter, the velocity increases and the pressure decreases.


True or False?Quick true of false question on fluids in motion?
True.





It coms from Conservation of Energy. A flowing fluid (liquid or gas) has 3 types of energy





Elevation (Potential Energy)


Velocity (Kinetic Energy)


Pressure (Pressure energy)





The sum of these is a constant along a streamline. If you increase one (velocity) you must decrease one of the other 2. In your example it was pressure.Quick true of false question on fluids in motion?
True. Remember the fluid has to keep the same current, which is the mass density moving through a cross section. So if the cross section of the tube becomes smaller, and the density is the same, the only thing that can change to make the current stay the same is the velocity and it must go up. I'm not sure what you mean by pressure though. You need to specify pressure of what on what. Do you mean the fluid on itself, the fluid on the tube, the atmosphere on the fluid. I don't know but ill assume that because its true the velocity goes up, it must also be true the pressure goes down based on how the question is asked.

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