What is ‘Bernoulli’s Theorem’? What does it explain?

It explains that when there is a restriction line a fluid flow line a ‘DP’ (differential pressure) is created. The DP is maximum at the vena contract point. The flow measured in the flow line is proportional to the square root of the DP measured where ‘K’ is a constant.

                                  Q = k  6sq root of DP
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