Pressure increases linearly with depth in incompressible fluid. Pressure at 10 m below water surface (ρ = 1000):
A2 atm absolute (= 1 atm + 1 atm gauge from ρgh = 10⁵ Pa)
B0.1 atm
C1 atm
D10 atm
Answer & Solution
Correct answer: A. 2 atm absolute (= 1 atm + 1 atm gauge from ρgh = 10⁵ Pa)
P = P_atm + ρgh. ρgh = 1000 × 9.8 × 10 = 98000 Pa ≈ 1 atm. Total ≈ 2 atm absolute.
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