eating a cookie cooled to -196 °C

Опубликовано: 19 Октябрь 2021
на канале: styropyro shorts

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mmmm liquid nitrogen. #shorts

This cookie was dipped in a bath of liquid nitrogen (-196°C) immediately before I ate it. So why did it not give me frostbite? Simple thermodynamics of course!

Let's say I ate a 3g chunk of this cookie. The cookie's specific heat is roughly 1.41J/gK (average of sugar and flour.) That means that heating it from -196°C to 37°C in my mouth took about 986J of energy.

How much energy is 986J? It's actually LESS than the amount of energy it takes to simply melt 3g of ice at 0°C and heat it to body temp!! (1463J). Water's specific heat (as well as enthalpy of fusion) are extremely high, which means that our bodies are relatively resilient to small objects of extreme temperatures. That means that a few grams of cryogenic cookie will barely change the temperature of my mouth.

If I would have held the cookie on one spot in my mouth then yeah I could have gotten frostbite, but I didn't so I was able to enjoy this tasty, cryogenic cookie. Pretty cool right?

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