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Second most abundant constituent of dry air in terms of volume after nitrogen is?

Second most abundant constituent of dry air in terms of volume after nitrogen is?

نائٹروجن کے بعد حجم کے لحاظ سے خشک ہوا کا دوسرا سب سے زیادہ پرچر جز ہے؟
Explanation

The composition of dry air is:

  1. Nitrogen (N2) - approximately 78.08% by volume
  2. Oxygen (O2) - approximately 20.95% (21%) by volume
  3. Argon (Ar) - approximately 0.93% by volume
  4. Carbon Dioxide (CO2) - approximately 0.04% by volume (varies with location and time)