Which Weighs More – Wet Air or Dry Air?

[caption id="attachment_5407" align="alignright" width="440"] CCA Share Alike 3.0 Unported by Santhosh kumar[/caption] Air is mostly a mixture of gases and plus water vapor. The primary two gases are nitrogen and oxygen. We will state up front that the traces of other substances in air don’t affect the outcome of whether wet air or dry air is heavier. It all has to do with molecular weights. Nitrogen Nitrogen is a diatomic gas—chemical formula N₂. Its atomic weight is 14, therefore its molecular weight is 28. Nitrogen constitutes 78% of the atmosphere. [caption id="attachment_14807" align="alignright" width="280"] Barometer[/caption] Oxygen Oxygen is also a diatomic gas—chemical formula O₂. Its atomic weight is 16, therefore its molecular weight is 32. Oxygen constitutes 21% of the atmosphere. Dry Air Again, not considering the traces of other…
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