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Old Sep 25th 2018, 07:49 AM   #1
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CO2 ice vs N2O liq which ones burns more your skin

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An intriguing question: what would give you the worst skin burn for the same contact time, dry ice or liquid N2O?and why?
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Old Sep 25th 2018, 09:58 AM   #2
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The question becomes:
which will remove more heat from the skin in the given contact time.

Can we have to assume that the contact time is less than the time required to reach thermal equilibrium?
Can we assume the initial temperature of the Dry Ice and the liquid N2O are the same?
Are we assuming a controlled contact, or an uncontrolled spill?
It might be quicker and easier to remove contact from a dry ice spill than from a N2O spill.
What is the "wetting" behaviour of liquid N2O in contact with skin?
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Old Sep 25th 2018, 11:29 AM   #3
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It's also important to know the size of the CO2 ice "chunk" that you come in contact with versus the amount of NO2 liquid. But in general, since NO2 may be liquid up to around 69 degrees F, and below about 12F turns into N2O4, it's quite possible that getting hit with liquid NO2 may feel no worse than a cold shower. But solid CO2 is at -70F or colder, so it is always a problem.
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Old Oct 4th 2018, 02:24 AM   #4
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Originally Posted by Woody View Post
The question becomes:
which will remove more heat from the skin in the given contact time.

Can we have to assume that the contact time is less than the time required to reach thermal equilibrium?
Can we assume the initial temperature of the Dry Ice and the liquid N2O are the same?
Are we assuming a controlled contact, or an uncontrolled spill?
It might be quicker and easier to remove contact from a dry ice spill than from a N2O spill.
What is the "wetting" behaviour of liquid N2O in contact with skin?
Let's fix for both 20s of controlled contact time. The initial temperature of the CO is 10C higher (Dry ice vs liquid N2O)
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