What factors do liquid pressure does ot depend on?

Answer 1

For liquids in containers (liquids in static conditions), the pressure in the liquid will

depend on the pressure at liquid-vapor interface, the density of the liquid and the

depth measured from the liq-vap interface down.

As an example let's assume we want to know the hydrostatic pressure in the ocean at a depth of 150 m.

We will assume:

An atmospheric (barometric) pressure of Po = 100 kPa (kilpascal).

Density of sea water of ρw = 1.03 x 103 kg/m3

Depth Δh = 150 m

Gravity acceleration g = 9.81 m/s2

Hydrostatic increment of pressure owed to depth Δh relation: ΔP = ρgΔh

Total pressure PT at a depth of Δh:

PT = Po + ρwgΔh = 100 x 103 Pa + !.03 x 103 kg/m3 ( 9.81 m/s2 )(150 m)

≈ 1 620 x 103 Pa ≈ 1 620 x 103 Pa [ 1 atm/101 325 Pa] ≈ 16.0 atm

The pressure increment we experiment at a depth of 150 m in the ocean is about 15 atmospheres (ΔP = ρgΔh).