Proof that the area under the curve dh/dt against t = height

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SUMMARY

This discussion centers on the verification of the relationship between the area under the curve of the rate of change of water height (dh/dt) against time (t) and the initial height of water in a juice bottle. The experiment involved measuring water levels at discrete intervals as it decreased from 10cm to 0cm in a rectangular prism-shaped container. Participants concluded that summing discrete height measurements effectively serves as an integration method, confirming that the area under the curve correlates directly with the initial height of the water.

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Hi, I have conducted an experiment to calculate the rate of change of water as it passes through 1cm levels (10 down to 0) across a uniform cross section of a juice bottle (rectangular prism shaped). I was wondering how I could verify/prove that the area under the curve is equal to the initial height (other than integrating it).
 
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You can't.

(Summing the discrete steps is the same as integrating.)
But surely it was easier to record the height of the water at discrete time intervals?
 

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