Dry ice is solid carbon dioxide, which can be quickly sublimated into gaseous carbon dioxide at room temperature, and the sublimation process should absorb heat; Putting it in food can reduce the temperature of food, so as to achieve the purpose of food preservation;

The "white gas" on the sea in the early morning of early spring is small water droplets formed by the cold liquefaction of water vapor in the air;

Tulips are black because they absorb all kinds of light.

So the answer is: sublimation; Liquefaction; absorb