大象传媒

One way to cook eggs is to boil them. But once the water has reached boiling point, does it matter if the heat is turned down? With two eggs cooking, the heat is reduced on one, while the other is left at full. To make it a fair test the eggs are heated for the same amount of time and are taken out of the water at the same time. Despite one egg being cooked in rapidly boiling water and the other not, the eggs cook exactly the same. This is because boiling, like melting, occurs at a fixed temperature for a pure substance. So long as it is pure, boiling water cannot get hotter than 100 degrees Celsius no matter how much you heat it.