Final answer:
Oxy-acetylene torches can generate temperatures of over 3000°C when acetylene is burned with oxygen, making it a valuable tool for welding and cutting metals.
Step-by-step explanation:
The oxy-acetylene torch generates the highest temperatures when it burns acetylene in oxygen, which can reach temperatures of over 3000°C. When mixed 1:1 with oxygen, the temperature can exceed 3000°C, making the oxy-acetylene torch one of the top tools for cutting and welding metals due to the intense heat it produces.