Vapor is a is a substance in the gas phase at a temperature lower than its critical temperature. Which means in case of water: small particles of water ( lets say a collection of molecules held together having a mass ) leaves the water surface in to the air.
Archimedes' principle states that the upward buoyant force = weight of the fluid that the body displaces
So the upward buoyant force on the water particle ( Which is vapor ) = weight of the air it displaces
We know that density of water > density of air.
So weight of the water particle > weight of the air it displaces
Which means weight of the water particle > upward buoyant force on it
So when you consider the equilibrium of the water particle; it going upwards is against Newton's laws.
Can someone please enlighten me on this ?
Thanks a lot.