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## Main Question or Discussion Point

I have a situation like this:

Where C is a air stream from a pipe, and A is the sky. Droplet will be made, and there will be fog.

Now I have to calculate the amount of water leaving the air.

In my book I found this equation:

Q

But do it have to be point C and A? Why not the two points where RH=100% ?

And how do I know how much water that there will be in the air as fog, and how much will raining down?

Where C is a air stream from a pipe, and A is the sky. Droplet will be made, and there will be fog.

Now I have to calculate the amount of water leaving the air.

In my book I found this equation:

Q

_{water}= Q_{dry.air.C}* (x_{A}- x_{C})But do it have to be point C and A? Why not the two points where RH=100% ?

And how do I know how much water that there will be in the air as fog, and how much will raining down?