Dry ice and liquid nitrogen are not the same substance. Dry ice is a solid form, liquid nitrogen is liquid gas, and its composition is different. Dry ice is carbon dioxide, while liquid nitrogen is liquid nitrogen. Yes, dry ice is used in food stalls to keep fresh, and snacks with smoke effect are liquid nitrogen.

are dry ice and liquid nitrogen the same substance?

liquid nitrogen is liquid at -181℃. Dry ice is carbon dioxide in solid state, molecules are still carbon dioxide, and the temperatures of both materials are very low. Liquid nitrogen can be cooled instantly, and active molecules can be frozen. Dry ice is mainly used for artificial smoke, refrigerants, food, etc. In the catering industry, dry ice is a solid carbon dioxide, which can be liquefied into a colorless liquid state and then quickly coagulated under pressure, thus forming dry ice. Liquid nitrogen is a colorless and odorless liquid at low temperature, which will produce smoke during evaporation, so it is used in food industry to bring special effects.

is dry ice used in the food stall?

dry ice can make food solidify in a short time, forming fewer ice crystals, and the freezing speed is faster than that of steam in cells, so it will not harm food, so the taste and freshness of thawed food can be maintained. Dry ice in a liquid nitrogen tank means that carbon dioxide will absorb heat during evaporation, so that the surrounding temperature will drop. If the temperature drops, the water vapor will melt, and then more heat will be released, forming something similar to smoke. So dry ice is added to wine, cocktails and drinks, which tastes cold and delicious, and there is a faint smoke in the cup.

Warm reminder:

It can be seen that dry ice and liquid nitrogen have different functions. Generally, the smoky food in food stalls is liquid nitrogen dry ice, which is widely used in food and other fields. Be careful not to touch it directly when using it, which is easy to get frostbite. That's my answer to the questions about dry ice and liquid nitrogen. I hope it can help you.