Problem 2.13 A pressure gauge consists of two cylindrical bulbs B and C each of 10 cm² cross Sectional area, which are connected by a U-lube with vertical limbs each of 0.25 sq. cm cross-sectional area. A red liquid of specific gravity 0.9 is filled into C and clear water is filled into B, the surface of separation being in the limb attached to C. Find the displacement of the surface of .separation when the pressure on the surface in C is greater than that in B by an amount equal to 1 cm head of water. Z/40 Z/40 B C WATER hB RED LIQUID X INITIAL SEPARATED FINAL SEPARATION Z LEVEL Y LEVEL Y 13