20 Distinguish between real and apparent cubic
expansivities of a liquid.
A glass bottle full of mercury has mass 500 g.
On being heated through 35°C, 2.43 g of
mercury are expelled. Calculate the mass o
mercury remaining in the bottle (cubic
expansivity of mercury is 1.8 x 10-4 per k,
linear expansivity of glass is
8.0 x 10-6 per k