Gas-free status is achieved when the atmosphere has

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Multiple Choice

Gas-free status is achieved when the atmosphere has

Explanation:
Gas-free means the atmosphere is essentially normal breathable air with no hazardous substances present. The best description is an atmosphere that has about 21% oxygen and no toxic gases detected. Why this is the right idea: 21% oxygen reflects ordinary ambient air and supports respiration. Lower oxygen levels, like 10% or 15%, create an oxygen-deficient, dangerous environment. And simply having some oxygen isn’t enough—there could still be toxic gases that pose health or ignition risks. So gas-free requires both normal oxygen (~21%) and no detectable toxic gases.

Gas-free means the atmosphere is essentially normal breathable air with no hazardous substances present. The best description is an atmosphere that has about 21% oxygen and no toxic gases detected.

Why this is the right idea: 21% oxygen reflects ordinary ambient air and supports respiration. Lower oxygen levels, like 10% or 15%, create an oxygen-deficient, dangerous environment. And simply having some oxygen isn’t enough—there could still be toxic gases that pose health or ignition risks. So gas-free requires both normal oxygen (~21%) and no detectable toxic gases.

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