Can I use liquified air in cooling foodstuff?
Answer:
There is no such thing as liquid air I beleive, as Nitrogen, Oxygen, Hydrogen and several inert gasses that air actually consists of would have different temperatures at which they become liquids. So, it wouldn't be a mixture of them all anyway. If taken separately, these substances would tend to be very specific each in its own way (in liquid state, especially).
*Liquid oxygen doesn't burn, it burns everything organic it gets mixed with
* Hydrogen is very flammable (blows up when mixed with oxygen and forms water, just give it a spark) - I can imagine how dangerous it would be in liquid state
* Nytrogen is more of a neutral substance; however, you never know what you find out
have a nice day all you people
At the temperature it is at, yes, it would freeze you in an instant. Liquid air is essentially liquid nitrogen. It is harmless except for its extreme cold.
Besides the fact that it's freakishly cold (about -200° Celsius) and will give you frostbite, the main danger is the liquified oxygen (oxidizer used in rocket fuel) part of the liquified air. If it comes in contact with organic materials, it can start burning especially if a spark is applied.
Liquid nitrogen, however is OK to use. Other than make everything cold to the point that it breaks, it will not harm your food, but will also give you frostbite if you get some on you.
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