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2026. 7. 1. 작업
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In critical applications tires are inflated using pure nitrogen ( link ). But carbon dioxide (CO2) is a larger molecule (will leak slower from the tire), as well as inert (will not oxidize rim and will not combust in case of an accident). ( link ) Also, from the ideal gas law , pressure is proportional to the density, individual gas constant and temperature. Assuming constant volume (i.e. P ∝ R*T), any change in temperature is "amplified" by the individual gas constant. And the gas constant is in favor of CO2: R(CO2) < R(O2) < R(N2) . ( ref ) So CO2 seems to give better pressure s
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Nitrogen is inert and doesn't affect rubber or the steel rim. Carbon dioxide is highly reactive and affects both the rubber by causing swelling in the rubber. It also would cause corrosion in iron based rims (particularly Carbon- Steel). Edit: When CO2 is mixed with moisture becomes Carbolic acid which is corrosive. It all depends on concentration. It is like comparing Acetic Acid commonly referred to as Vinegar. At 3% you can put on french fries. At industrial strength 97% not only will it dissolve the french fry but also human flesh right down to the bone very fast. As for CO2 affect on rubber I cited a industry source-(Air Liquide) a company that specialized in compressed gases. In the case of automotive tires using CO2 would probably cause catastrophic failure. My experience with Nitrogen is that I have noticed it to be much more quieter while driving and less pressure variations when the temperature varies from season to season. http://encyclopedia.airliquide.com/encyclopedia.asp?
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