Final answer:
Heating a refrigerant cylinder with a torch can cause high pressure and an explosion, as the gas inside the can expands. The combustible refrigerant also poses the risk of incineration and explosion.
Step-by-step explanation:
Heating a refrigerant cylinder with a torch can cause high pressure and even an explosion. The can contains a gas at a constant volume, so heating it can increase the pressure, potentially causing the can to burst. Additionally, the refrigerant inside the can is combustible, so heating it could lead to incineration and explosion.