dl boiling

Dry ice, also known as solid carbon dioxide (CO₂), is the solid form of carbon dioxide that sublimates directly into gas at −78.5°C (−109.3°F) at standard atmospheric pressure. It does not pass through a liquid phase under normal conditions, making it unique among common cryogenic substances. Dry ice appears as a white, brittle solid with a characteristic smoking appearance due to the rapid sublimation of its surface when exposed to warmer air, which creates visible CO₂ gas and condensed water vapor. The substance is odorless and colorless in its gaseous state, though its visual effect is striking and theatrical in culinary applications.

Dry ice is employed in modern gastronomy primarily for visual and sensory effects rather than as a nutritional component. It is used to create dramatic smoking presentations in cocktails, desserts, and plated dishes, where the sublimation creates a fog effect that enhances the dining experience. Chefs use dry ice to rapidly freeze elements such as foams, mousses, and liquid centers, enabling the creation of textural contrasts. It is essential to handle dry ice with insulated gloves or tongs, as direct contact causes frostbite; it should never be ingested directly, though food that has been in contact with it may be consumed once all dry ice has fully sublimated.