b) Figure (i) represents the full level of glycerin in the copper vessel at 20 ℃. Figure (ii) represents the expansion of the copper vessel as well as glycerin when heated to 30 ℃. i) What do level AB and BC represent? [1] ii) Find volume of level AC. [Given: γ = 5.3 × 10−4℃−1 for glycerin α = 16.7 × 10−6℃−1 for copper]