They used their observation and collaboration skills to investigate what happens to ice when salt is added to it and melting starts to occur. They were amazed to find out that the salt made the ice melt faster. Then, discussing it as a class decided that they would research the reason for this. The children discovered that, because the salt first dissolves in the film of liquid water that is on the surface, it lowers its freezing point below the ices temperature. Ice in contact with salty water therefore melts quicker.
Storks’ were also fascinated to watch the water vapour rising into the air as water boiled, a process known as evaporating. They were even more interested in the process of condensation; this occurs as the water vapour cools and turns from a gas back into a liquid. There were lots gasps of astonishment as they witness this and much discussion about how this occurs and at what temperature. A thoroughly enjoyable Science lesson!
By Kerry Barnard
Year 4 Storks Teacher