Converting Pressure Units in Hydrodynamics

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The discussion focuses on the conversion of pressure units in hydrodynamics, specifically addressing why Poil equals PHg and PH2O equals PHg. It emphasizes the importance of converting head measurements to standard units, such as meters of water or mercury (Hg), using dynamic pressure calculations in Pascals (Pa). The total head is defined as the sum of pressure head, velocity head, potential head, and friction head, with a note that friction head can sometimes be neglected in calculations.

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For Q4.7, why Poil = PHg ?
For Q4.8, why PH2O = PHg ?
P is pressure.
How can I know they are equal from the question?
 

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4.7: hvel=v2/2g the units will be meters of diesel oil. That is not a standard unit to measure head. It is usually measured in meters of water or Hg. To make the conversion convert first to a dynamic pressure, in Pa. Pd=head*specific weight of water (H20. Head in Hg=Pd/specific weight of Hg

4.8 Total Head=Pressure head+Velocity head+potential head + friction head

Convert total head in m of water to m of Hg as described above

Hint: some times you can neglect friction head (friction in piping)
 

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