This is because the pressure will build so up so much that the can will burst (and explode if there is a naked flame nearby) the gas pressure increases. more of the liquefied propellant turns into a gas.
This is Boyle's Law. It states pressure and volume have an inverse relationship.
Hence, the magnetic behaviour of the complex is paramagnetic. The oxidation number of the central metal atom: The oxidation number of the metal iron is +3.
