What happens if propane is released into a confined, poorly ventilated space?

• A. It disperses harmlessly if ventilation exists.
• B. Propane can accumulate and form an explosive mixture, creating a fire/explosion hazard.
• C. It cannot ignite in open air.
• D. It will dissipate within seconds regardless of ventilation.

Answer: (B)

When a flammable gas is released into a confined, poorly ventilated space, it can accumulate instead of dispersing. Propane is heavier than air, so it tends to settle and fill lower areas where there is little air movement. As the concentration increases, it can enter the gas’s flammable range, meaning any ignition source—spark, flame, or hot surface—could ignite the mixture. This creates a real fire or explosion hazard, which is why such a release needs immediate ventilation, source control, and avoidance of ignition sources.