# In the left knee of communicating vessels filled with water, there is a layer of kerosene 20 cm

In the left knee of communicating vessels filled with water, there is a layer of kerosene 20 cm high above the water. Which knee has the higher fluid level? how much?

These tasks: hker (the height of the kerosene layer above the water) = 20 cm.

Constants: ρwater (water density) = 1000 kg / m3; ρker (kerosene density) = 800 kg / m3.

1) The corresponding height of the water layer: ρwater * g * hwater = ρker * g * hker, whence we express: hwater = ρker * hker / ρwater = 800 * 20/1000 = 16 cm.

2) The difference in the height of the knees with kerosene and water: Δh = hker – hwater = 20 – 16 = 4 cm.

Answer: In the left knee with kerosene, the liquid level is 4 centimeters higher.

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