With 2kg of dry ice in 20L of Hot Water, you'll see thick fog being produced for about 10 minutes. Once the water begins to cool and the dry ice sublimates, the amount of fog produced reduces. Dry ice creates a fog effect because of its cold temperature.
When immersed in hot water, it creates a cloud of water vapour fog. When the water is colder than 15 C, the fog effect stops but the dry ice continues to sublimate and bubble. In general, it will last longer on a damp day than on a hot day.
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