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Originally Posted by billbo911
The other type of "fog machine" usually makes use of dry ice as it's source of carbon dioxide. Honestly, I do not know what process is used to cause the dry ice to evaporate quickly enough to generate the blanket of "fog" that hugs the ground, or stage, that this type of machine generates.
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It is done by submersing the dry ice in hot water. This causes a rapid change in state that allows for a lot of "fog" to roll onto the stage in a short period of time.