Asphyxia is generally limited to enclosed spaces, and the deficiency of breathable air in an enclosed space can occur with any of the following conditions. Indicate the condition that will NOT cause asphyxia.
• Enclosed space hazards on tankers and cargo ships • Normal atmospheric oxygen percentage needed for safe breathing • How rusting, inert gas, and cargo vapors affect oxygen levels
• Think about which situations actually reduce the amount of usable oxygen in the air inside a tank or compartment. • Ask yourself: in which option would a person still have enough oxygen to breathe normally? • Consider how each listed condition changes the air: does it REMOVE oxygen, DISPLACE oxygen, or LEAVE oxygen at a safe level?
• Recall that normal air contains about 21% oxygen – compare each option to this value. • For each condition, decide whether oxygen is being consumed (used up) or displaced (pushed out) of the space. • Identify the one condition where the atmosphere would still be considered safe for breathing in terms of oxygen content.
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