Mercury is poured into a U-shaped glass tube. Water is then poured into one of the limbs of the tube. Oil is poured into the other limb until the surfaces of the mercury are at the same level in both limbs. Fig. shows the result. State a condition that must be true in order for the mercury surfaces to be at the same level in both limbs of the tube. The height of the water column is $0.25 \mathrm{~m}$. The height of the oil column is $0.32 \mathrm{~m}$. The density of water is $1000 \mathrm{~kg} / \mathrm{m}^{3}$. Calculate the density of the oil. The liquids in the U-shaped glass tube has been changed to different liquids, named $\mathrm{P}$ and $\mathrm{Q}$, which do not mix, as shown below. What is the ratio of density of $\mathrm{P} /$ density of $\mathrm{Q}$ ?

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