What about a mole of ideal gas?
Alice and Bob are arguing over a mole of ideal gas.
Alice : If I heat this gas, then by Gay-Lussac's Law, its pressure must increase, and by Boyle's Law, its volume must decrease.
Bob : But Alice, I don't think you are right with that. If I heat the same gas, by Charles' Law, its volume must increase, and by Boyle's Law, its pressure must decrease.
What can you say about it?
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1 solution
No mention is made whether or not "this gas" is free to expand. Hence, it makes moot the application of these laws, i.e., which laws apply depends.
Furthermore, Gay-Lussac's law assumes a fixed volume, while Boyle's law does not. Boyle's law assumes a fixed temperature, while Charle's law does not.