Question

which of the following can cause oxygen consumption in a confined space?

welding, cutting, and brazing
bacterial and chemical reactions (decay and rust formation)
the number of people working in the space
all of the above

Explanation:

Analyze hot work processes

Welding, cutting, and brazing consume oxygen directly through combustion and oxidation reactions.

Analyze biological and chemical reactions

Bacterial action (decay of organic matter) and chemical oxidation (rust formation on steel walls) consume oxygen over time.

Analyze human respiration

People working inside a confined space consume oxygen and release carbon dioxide through breathing.

Answer:

• Welding, cutting, and brazing
• Bacterial and chemical reactions (decay and rust formation)
• The number of people working in the space
• All of the above (Correct answer)