A 300mL sealed spray can containing insect spray is kept outside at a temperature of 15 Celsius. It is accidentally dropped into a campfire, causing the temperature inside the can to quickly rise to 99 Celsius. What effect does this have on the volume of the gas inside the can ?

The twister and runaway train are two coasters at the same amusement park. both coasters start at the same height. the coaster for the twister is twice the mass of the coaster for the runaway train. which roller coaster has greater gravitational potential energy at the start of the ride?