Question

Question #7762a

Answer 1

Boyle's law assumes that a gas in a starting situation (`P_1V_1`) will be changed by altering the volume and pressure (`P_2V_2`) but that it remains in the gas state.

If the gas is changing state, it is either beginning as a gas and turning into a solid or liquid. Or it could begin as a solid or liquid and turn into a gas.

Either way, you can't apply a gas law to something which is not in the gas state.