Carbon dioxide is heavier than air because its triatomic molecules are more massive than the O...

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Carbon dioxide is heavier than air because its triatomic molecules are more massive than the O₂ and N₂ molecules that dominate the atmosphere. Although CO₂ is nontoxic, people have been killed in accidents or natural disasters that release large quantities of CO₂. How is this possible? Carbon dioxide is heavier than air because its triatomic molecules are more massive than the O₂ and N₂ molecules that dominate the atmosphere. Although CO₂ is nontoxic, people have been killed in accidents or natural disasters that release large quantities of CO₂. How is this possible?

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