Why do gas laws use degrees Kelvin rather than degrees Celsius?
Kelvin is an absolute scale, whereas Celsius is arbitrary.
What does this mean?
In order for gas laws to work, temperature has to be calculated on an absolute scale.
Celsius, on the other hand, has an arbitrary
Another problem with Celsius is that negative degrees are very possible, which may cause confusing results.
To extend this thought, other absolute temperature scales such as Rankine would work fine for gas laws. Fahrenheit, which is arbitrary, would not.