The apparatus shown in the figure consists of four glass columns connected by horizontal section. The height of two central column B and C are 49 cm each. The two outer columns A and D are open to the temperature. A and C are maintained at a temperature of 95C while the columns B and D are maintained at 5C. The height of the liquid in A and D measured from the base the are 52.8 cm and 51cm respectively.
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