You think you know how clouds work? Did you know that water vapor is less dense than air, so it rises, and this is part of why clouds form? Seriously, the ato

You think you know how clouds work? Did you know that water vapor is less dense than air, so it rises, and this is part of why clouds form? Seriously, the atomic mass of H2O is 18. Compare to the other major parts of air which are N2 at 28, O2 at 32, Ar at 40, and CO2 at 44. Everything beyond that is a rounding error. Therefore, all else being equal, wet air rises.