A layer of oil floating on the surface of water


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A 120-cm-thick layer of oil floats on a 140-cm-thick layer of water. What is the pressure at the bottom of the water layer?

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Answer:

The pressure at the bottom of the water layer is 1.25\times10^{5}\ Pa

Explanation:

Given that,

Oil layer = 120 cm

Water layer = 140 cm

We need to calculate the pressure at the bottom of the water layer

Using formula of pressure

P_{atm}=P_{atm}+P_{oil}+P_{w}

P_{ab}=p_{atm}+\rho_{oil} gh+\rho_{w} gh

Put the value into the formula

P_{ab}=1.013\times10^{5}+881\times9.8\times1.2+1000\times9.8\times1.4

P_{ab}=125380.56\ Pa

P_{ab}=1.25\times10^{5}\ Pa

Hence, The pressure at the bottom of the water layer is 1.25\times10^{5}\ Pa


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