Graphs of heatingVersión en línea Isopropyl alcohol is a substance which is commonly used to clean surfaces as it eliminates dirt easily, it is also a very effective disinfectant. The graph below shows this alcoholic substance being heated. Match each sentence with the corresponding number. por José Francisco Illanes García 1 The temperature does not change: The solid transforms into liquid. (Melt) 2 The temperature of the solid increases until it reaches -89 ºC. 3 The temperature does not change: liquid turns into gas. (Boil) 4 The temperature of the gas increases until it stops being heated. 5 The temperature of the liquid increases until it reaches 83 ºC.