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Singing coin
Press a heated coin firmly against a piece of dry ice. The coin will sound loudly as the heat causes the dry ice to instantly turn into gas on contact. The gas formed around the dry ice repels the coin, while still adhering firmly to the coin. As a result, one may only hear the vibration i.e. the singing sound. This effect may also be realised when pressing a heated spoon firmly against a piece of dry ice.
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Inflating balloons
Force the neck open of an un-inflated balloon with your fingers, stretching the orifice to allow one or more 16 mm pellet(s) of dry ice. Tie the balloon and set aside, observing it for a while. For quicker results, drop the balloon into a swimming pool - it will help to heat up the dry ice. At first the balloon will sink, but as soon as it begins to inflate it will steadily rise to the surface. Avoid placing too much dry ice in the balloon, as it will eventually burst.
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Making a volcano
Dry ice will add exactly the right special effects to a volcano. Keep a container inside the volcano to hold hot water - the hotter, the better. At the time of "eruption", use gloves and place small pieces of 16 mm pellets into the hot water. The volcano will bubble and "smoke" for a few minutes. The "smoke" will spout from the top and flow down the sides (as CO2 is heavier than air) for a few minutes. Make sure to seal the bottom of the volcano properly, otherwise the "smoke" will leak out of the the bottom.
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