# 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:

$\overline{){\mathbf{P}}{\mathbf{=}}{\mathbf{h}}{\mathbf{\rho }}{\mathbf{g}}}$

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

###### 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.