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We have to use Kelvin temperature since in this formula T could be at the denominator. If we were using Celsius unit, then we would have had zero at the denominator at some point. Because a zero denominator does not give us a solution, we use kelvin. when kelvin is zero that suggests we have an absolute zero temperature and there would be no gas law.
Temperature has to be in Kelvin always. Unlike P or V in the PV=nRT equation, where P can be in atm/Pa/etc or V can be L/m^3/etc or they can both be combined into eV/J/cal, T always has to remain in K (similar to n, which always has to remain in mol).
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