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What is a critical safety consideration regarding gas given off by liquid oxygen?

  1. It will dissipate quickly in the atmosphere.

  2. It will ignite immediately upon contact with organic materials.

  3. It will collect and stay in low areas.

  4. It is harmless and poses no risk.

The correct answer is: It will collect and stay in low areas.

Liquid oxygen is a powerful oxidizer that can significantly increase the flammability of materials when it comes into contact with them. One critical safety consideration is that the gas given off by liquid oxygen can indeed collect and stay in low areas. This is primarily due to its density; oxygen gas is heavier than air and can accumulate in depressions, trenches, or other low-lying areas. As a result, this can create a hazardous environment where flammable substances might be present, leading to an increased risk of fire or explosion if an ignition source is introduced. Understanding the behavior of oxygen in various environments is crucial for ensuring safety during firefighting and handling procedures. Proper ventilation is essential to prevent the accumulation of oxygen-rich gases, which could create a potentially dangerous situation.