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Old 12-31-2019, 03:16 PM   #8065 (permalink)
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Chemistry does not step in line with a % increase on the Kelvin scale.
As you increase the temperature the rate of reaction increases. As a rough approximation, for many reactions happening at around room temperature, the rate of reaction doubles for every 10C rise in temperature.

You have to be careful not to take this too literally. It doesn't apply to all reactions. Even where it is approximately true, it may be that the rate doubles every 9C or 11C or whatever. The number of degrees needed to double the rate will also change gradually as the temperature increases.
Mind you, fire starts when a tipping point is passed. Even a small increase in reaction speed can make the difference for a lot of potential fires. A 10% increase in reaction speed, which a 2 degree Celsius increase in temperature would amount to, will have a big effect.

As for CO₂ being inert, so is nitrogen which makes up 79% of the air. The 0.02% increase in inert gases the extra CO₂ stands for is insignificant, unlike its effect on acidity and heat radiation shielding.
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