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What properties make dry ice boil in water?

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The other answer here is correct to a degree, but doesn't get at the actual process. The point at which frozen CO2 sublimates is basically its boiling point. This temperature is -108 degrees f, or -78 degrees c. This is well below the freezing temperature of water, or 32 degrees f, 0 degrees c. read more

When putting the dry ice in water, the thermal energy moves from the hottest material to the coldest. The energy transferred from the water to the CO2 is enough to bring the surface of the ice above the freezing point, in effect, forcing the solid CO2 into a gas again. read more

Physical Properties of Dry Ice Dry ice is the solid form of carbon dioxide that is sometimes referred to as Cardice or card ice. It has a molecular weight of 44.01g/mol and is a colorless, odorless gas or liquid or a white opaque solid (depending on the state it is in). read more

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