Final answer:
Hot work in enclosed spaces requires the gas supply to torches be shut off outside the enclosed space when not in use.
Step-by-step explanation:
The correct answer is option Chemistry. Hot work in enclosed spaces requires that the gas supply to torches be shut off outside of the enclosed space whenever the torch is not used or unattended. This is because hot work, such as welding or cutting with torches, involves the use of flammable gases like acetylene or oxygen.
These gases can be dangerous if not properly handled and can lead to fires or explosions if left unattended. Shutting off the gas supply outside of the enclosed space ensures that there are no chances of accidental ignition or leaks in the enclosed space.
The correct answer emphasizes the importance of shutting off the gas supply outside enclosed spaces when torches are not in use, as part of hot work safety procedures. Wearing safety gear, such as goggles, and keeping workspaces well-ventilated are crucial. Loose clothing should be secured, and proper handling and storage of flammable gases are mandatory.