"a lawyer is a lawyer, he is either a social engineer or a parasite on society"
Answer:
Water vapor is less dense than these heavy molecules; in humid air, water vapor takes up space that would normally be occupied by nitrogen and oxygen. Known as the "vapor buoyancy effect," this phenomenon renders humid air lighter than dry air of the same temperature, pressure and volume.
The answer is D. I had this question on a USATestPrep and it said it was right.
