Dry ice is solid carbon dioxide, because the temperature of dry ice is very low, the temperature is -78.5 degrees Celsius, so it is often used to keep objects in a frozen or low temperature state. Dry ice can quickly freeze objects and reduce the temperature, which has been widely used. Dry ice does not change from solid to liquid when it is dissolved, but sublimates directly from solid to gas, so its melting will not produce any water or liquid, which is why we call it "dry ice".

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