Squre Root in Transmitter

Because Q is proportional to √ΔP.

The pressure drop that a properly-designed orifice flowmeter experiences is proportional to the square of the flowrate through it. So to obtain the flow signal as a linear function, the square root of the pressure is taken.

Other flow measuring techniques are available. These days, differential pressure across an orifice is "so 1973"....

It is highly inadvisable to publish an e-mail address in an international forum such as CR4, as has been advised here countless times before. Spam-bots harvest these addresses easily, and will quickly bombard the address with adverts for personal services and appliances, non-prescription pharmaceuticals, and just about any money-getting scam that one might ever think of, thereby rendering the address practically useless.

It would be so much better if the @ character was not available on the CR4 character set!

Am I alone in thinking that the address we asked to send emails to might also be an email harvester?

My initial response to the question was

Because thats what you have to do to get the right answer.

You could use PI = 3 to make the maths easy but your anwers wouldnt be any good!

Bec. the flow velocity flowing in a pipe is proportional to the square root of difference in pressure due to a flow constriction along the pipe. Daniel Bernoulli discovered this relationship.