00:01
So for this question me, to use the poissonier equation.
00:10
And this simply says that the volume flow rate is equal to the change, rather the difference in pressure needed to maintain this volume flow rate, times the radius to the fourth power, divided by 8 over pi, times the viscosity of this liquid, times the length.
00:34
Now, the only thing that is changing is the radius.
00:41
And because the only thing that's changing is the radius, and we need to find the pressure and the volume flow rate is staying constant, it actually, the volume flow rate itself doesn't matter.
00:58
We can actually simply just create a relationship and say that the change in pressure in the first section times the radius in the first section to the fourth power equals the change and pressure needed for the second section times the radius in the second section to the fourth power.
01:18
Again, the viscosity, the length, 8 over pi is a constant volumetric flow rates.
01:25
All of these are constants.
01:27
The only thing that is changing is the radius and the change in pressure.
01:30
We have a change in pressure of the first section.
01:33
We simply need to isolate this variable right here...