What is the primary atmospheric gas by volume in dry air at sea level?
Answer and explanation
Correct answer: D. nitrogen (approximately 78% by volume)
- Step 1: Dry air consists of ~78% Nitrogen (N2), ~21% Oxygen (O2), ~0.93% Argon (Ar), and trace gases. Answer: nitrogen (approximately 78% by volume). Why not the others: Oxygen is second most abundant at 21%.
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