2. Mass production needs a special dry ice maker. Dry ice should be stored in high-pressure steel cylinders. If there is no high-pressure steel cylinder, it can be stored in the freezer of the refrigerator for 5 ~10 days.
3. Dry ice is solid carbon dioxide, which is obtained by condensing carbon dioxide into colorless liquid under the pressure of 6250.5498 kPa, and then rapidly solidifying under low pressure.
4, carbon dioxide is invisible, in fact, it is not, carbon dioxide smoke is water mist, carbon dioxide absorbs a lot of heat when it changes from solid to gas, so that the temperature of the surrounding air drops quickly.
5. When the air temperature drops, its solubility in water vapor becomes smaller, and the water vapor liquefies and releases heat, which becomes small droplets, that is, fog. This is the same as the "white fog" of popsicles in summer. They are all small water droplets, not other gaseous substances.