Measuring Water Flow From an Elevated Bottle: Physics in Action!

[Angeltas1]

If I do an experiment where I want to work out how fast a certain amount of water will empty from an ordinary plastic bottle elevated greater than horizontal, what Physics could I apply if I measure the angle at which it is emptied, the height above the ground and how long it took to empty. I know the mass.

Thanks

 

[Naty1]

I'd check into fluid flow thru an orifice. That has to be modeled somewhere.

But in your case I'm pretty sure turbulance, say bubbling and gurgling, would make any such modeling or predicitive effort rather complex. And I'd guess as the water empties the pressure declines slowing the flow.

In other words, it not as simple as predicting the volme of water flow via a fixed size pipe with a fixed pressure.

Believe it or not there is a related discussion here...but beware this one gets complex:
https://www.physicsforums.com/showthread.php?t=530322&highlight=turbine