Question

what is meant by pressure head? derive an differential manometer​

Answer 1

$\huge\bold\color{aqua}{Pressure\:Head}$

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).

$\huge\bold\color{pink}{Differential\: Manometer}$

An instrument in which the difference in pressure between two sources is determined from the vertical distance between the surfaces of a liquid in two legs of an erect or inverted U-shaped tube when each of the legs is connected to one of the sources.

Answer 2

Answer:

Pressure head - In fluid mechanics, pressure head is the height of the 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 bracket).

Nanometer measure - A differential manometer measure the pressure difference between two points, in this case P1 - P5. Given h, pm and pw, determined P1 - P5. Apply the Barometer equation to determine P2 relative to P1 and P3 relative to P5