Background information:
In the winter it can get freezing, and the roads and pavements can get very icy. Bill, the caretaker at Yams High School, wants to find a way to melt the ice quickly, so it is safer in the morning for children walking to school. The superintendent decides to do an experiment to investigate how the ice can be melted quickly.
He firstly measures the temperature of some ice cubes. The temperature is -4°C. He then takes 4 ice cubes and puts each on a separate dish. He leaves one uncovered, he covers one in salt, he covers one in flower, and he covers one in a cotton material.
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