Question

why is a constant pressure - head apparatus necessary?
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Answer 1

Answer:

In fluid mechanics, pressure head is the height of a liquid column that corresponds to a particular pressure exerted by the liquid column on the base of its container. It may also be called static pressure head or simply static head (but not static head pressure).

Mathematically this is expressed as:

{\displaystyle \psi ={\frac {p}{\gamma }}={\frac {p}{\rho \,g}}}

Answer 2

Answer:

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