Pressure in fluids:

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

1 Pa = 1 N/m^{2}

- h
_{o}= ? - h
_{w}= 80 cm(1m/100cm) = 0.8 m - ρ
_{o}= 900 kg/m^{3} - ρ
_{w}= 1000 kg/m^{3} - g = 9.8 m/s
^{2} - P
_{tank}= 111.0 kPa(1000Pa/1kPa) = 111000 Pa - P
_{atmosphere}= 101325 N/m^{2}

P_{w} = h_{w}ρ_{w}g = 0.8 × 1000 × 9.8 = 7840 N/m^{2}

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/m^{3}.