# Physics

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an oil layer floats on 87 cm of water in a tank. the pressure at the bottom of the tank is 120.0 kPa. How thick is the oil?

• Physics -

p = p(atm) + ρ(w) •g•h(w) + ρ(oil) •g•h(oil),
p = 120 000 Pa
p(atm) =101325 Pa,
ρ(w) = 1000 kg/m^3
ρ(oil) = 850 kg/m^3 (depends on the type of the oil) !!!!
h(w) = 0.87 m.
g =9.8 m/s^2
h(oil) =
={p- p(atm) + ρ(w) •g•h(w)}/ ρ(w) •g =
=1.22 m

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