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The conversion will depend on the substance you are trying to convert (water, oil etc.) and it's often done in one unit of area (1 square metre area)

We know:

Pressure = Force / square area

and Pa = N/m2

with N = mass x acceleration of gravity

Let's say the substance is water, with a density of 1000 kg/m3

and we're doing a 1m2 of water area with H (head/height of water).

Therefore,

Force = 1000 kg/m3 x [1m2 x H m] x 9.81m/s2 = 9810 kg.m/s2 (or N, Newton)

1 Pascal = 1 N/m2 or (9810xH) N/m2

Rearranging the above, you get H (head of water) = 1 / 9810

or 1 Pa is equivalent to approximately 0.0001m of water at the normal density

Conclusion:

1 Pa = 0.0001m of head (water at room temperature)

1 kPa = 0.1m of head (water at room temperature)

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