The history of dry ice can be traced back to the British Faraday and Debi in 1823, they liquefied carbon dioxide for the first time, and then the German Qiluoli successfully produced solid carbon dioxide. But at that time it was limited to research use and was not widely used. Carbon dioxide is invisible. In fact, it is not (carbon dioxide) smoke, but (water) mist. When carbon dioxide changes from solid to gas, it absorbs a lot of heat, so that the temperature of the surrounding air drops quickly, and the air temperature drops. The solubility of water vapor becomes smaller, the water vapor undergoes a liquefaction reaction, releases heat, and becomes small droplets, which are mists. This and summer popsicles mean "white mist", which are small water droplets, not other gaseous substances. That is, we see white mist instead of white smoke. Dry ice is much cooler than water, so it is equivalent to heating dry ice, which absorbs heat and sublimates, lowering the temperature of water and even freezing it.