How much pressure does seawater add per foot of depth?

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Multiple Choice

How much pressure does seawater add per foot of depth?

Explanation:
Pressure in seawater rises as you go deeper because every additional foot of water above adds its weight to the pressure. For seawater, the density is about 1025 kg/m^3, so the hydrostatic pressure increases roughly ρg per meter. That works out to about 3060 Pa per foot, which converts to roughly 0.445 psi per foot of depth. So at 10 feet you’re adding about 4.45 psi, at 33 feet about 14.7 psi (roughly 1 atmosphere of pressure from the water column). The value of about 0.445 psi per foot is the standard reference for seawater.

Pressure in seawater rises as you go deeper because every additional foot of water above adds its weight to the pressure. For seawater, the density is about 1025 kg/m^3, so the hydrostatic pressure increases roughly ρg per meter. That works out to about 3060 Pa per foot, which converts to roughly 0.445 psi per foot of depth. So at 10 feet you’re adding about 4.45 psi, at 33 feet about 14.7 psi (roughly 1 atmosphere of pressure from the water column). The value of about 0.445 psi per foot is the standard reference for seawater.

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