6
Stage 2: H 2O(g) [100ƒC] =H 2O(l) [100ƒC]
Stage 3: H 2O(l) [100ƒC] =H 2O(l) [0ƒC]
Stage 4: H 2 O(l) [0ƒC] =H 2 O(s) [0ƒC]
Stage 5: H 2O(s) [0ƒC] =H 2O(s) [240ƒC]