Why Must We Use Absolute Temperature for Ideal Gas Law?

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jack1234
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Why must we use absolute temperature in the ideal gas law (PV = NkT)?
Why using the Celsius scale would give nonsensical results?

I am not sure what is the reason, can anyone helps?
 

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The temperature measured in Kelvin degrees cannot ever be negative.
 
At 0C the pressure in an ideal gas is not zero. It's zero at absolute zero. Which is 0K.
 

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