How cool is your drink?
3
Understanding ice cream
May children in your class will want to experiment with using ice cream to in their cold drinks.
Ice cream is an interesting combination of materials. It is basically a mixture of fat and water In the form of an emulsion - a mixture in which the fat is present as very small globules suspended in water. It is also a foam - a mixture of liquid or solid and a gas in which the gas is present as small bubbles suspended in the liquid or solid. When the emulsion is cooled, some of the water freezes and crystals of ice start to form.
Simply freezing the emulsion would give a creamy ice-lolly. It is the inclusion of air by whisking as the emulsion freezes that gives ice cream. The whisking also causes some of the fat globules to join together. This, with the air bubbles and ice crystals, gives ice cream its characteristic light creamy texture.
Ice cream at greater and greater magnification