I've got a car with an internal volume of #12000# #L#. If I drive my car into the river and it implodes, what will be the volume of the gas when the pressure goes from #1.0# #atm# to #1.4# #atm#?
We use Boyle's Law:
The answer is all above, but let me share a tip. It's possible to memorise Boyle's, Charles' and Gay-Lussac's laws and use them appropriately.
But I find it simpler to just memorise the Combined Gas Law, and then leave out anything that does not change in a particular question:
In this case, since temperature isn't mentioned, we simply leave it out and get Boyle's law.