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For the hydrostatic pressure, when do we use [ p = ρ.g.h ] and [ p = ρ.g.hcg ]

where:

ρ = density

g = acc of gravity

h = height of water column

hcg = the distance to the center of gravity from the surface of water downward

where:

ρ = density

g = acc of gravity

h = height of water column

hcg = the distance to the center of gravity from the surface of water downward

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