Question

At what depth below the free surface of oil having a density of 784 kg/m³ will the pressure be very nearly equal to 1 bar?
1. 10 metres
2. 14 metres
3. 13 metres
4. 7.84 metres

Answer 1

Correct Answer - Option 3 : 13 metres

At a depth 'h' below the free surface of a liquid of density 'ρ', the pressure is given by 

P = ρgh

Given P = 1 bar = 10⁵ Pa, ρ = 784 kg/m³

⇒ 1 × 10⁵ = 784 × 9.81 × h

∴ h ≈ 13 m