Question

An open tank contains water up to a depth of 2 m and above it an oil of specific gravity 0.9 for a depth of 1 m. Find the pressure intensity at the interface of the two liquids. 
1. 7829 N/m²
2. 9829 N/m²
3. 8829 N/m²
4. 6829 N/m²

Answer 1

Correct Answer - Option 3 : 8829 N/m²

Concepts:

Pressure at a depth 'h' from free surface is:

P = ρgh

Calculation:

Given:

S_oil = 0.9, ρ_oil = 900 kg/m³, h_oil = 1 m, h_water = 2 m

P = ρ_oil × g × h_oil

∴ 0.9 × 1000 × 9.81 × 1 = 8829 N/m²