Dry Ice is solid carbon dioxide, which is obtained by liquefying carbon dioxide into colorless liquid under the pressure of 6250.5498 kPa, and then rapidly solidifying under low pressure. Now dry ice has been widely used in many fields.

trait

Carbon dioxide can't be seen. In fact, it's not smoke, but fog. When carbon dioxide changes from solid to gas, it absorbs a lot of heat, which makes the temperature of the surrounding air drop quickly, and the air temperature drops. Its solubility in water vapor decreases, and water vapor liquefies. When it releases heat, it becomes small droplets, which is fog.

This is the same as the "white fog" of popsicles in summer. They are all small water droplets, not other gaseous substances. That is, we see white fog instead of white smoke.