Problem: An oil layer floats on 80 cm of water in a tank. The pressure at the bottom of the tank is 111.0 kPa.How thick is the oil? Suppose that the density of oil is 900 kg/m3.

FREE Expert Solution

Pressure in fluids:

P=hρg

1 Pa = 1 N/m2 

  • ho = ?
  • hw = 80 cm(1m/100cm) = 0.8 m
  • ρo = 900 kg/m3
  • ρw = 1000 kg/m3
  • g = 9.8 m/s2 
  • Ptank = 111.0 kPa(1000Pa/1kPa) = 111000 Pa
  • Patmosphere = 101325 N/m2 

Pw = hwρwg = 0.8 × 1000 × 9.8 = 7840 N/m2

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Problem Details

An oil layer floats on 80 cm of water in a tank. The pressure at the bottom of the tank is 111.0 kPa.

How thick is the oil? Suppose that the density of oil is 900 kg/m3.

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