How much does a cloud weigh?

That depends. Is it a big cloud, or a little cloud? What kind of cloud?

I don't know. I am going to guess that it weighs a lot. (Probably some thousand pounds or so, depending on how large the cloud is...)

Water = eight pounds a gallon
Pint of water = 1 lb

We need to know what kind of cloud it is, how large it is, etc.

So it depends!

Cloud Making Activity- (burner)
The lit paper put ash into the small containers air. When it was heated, this created a temperature difference between the ice at the top and the bottom of the container which was heated. This caused the water at the bottom of the container to form a cloud near the top.

Cloud Making Activity- (bottle)
The lit paper put ash into the gatorade bottle. When we started squeezing the bottle, we were creating rapid pressure changes. When you squeezed the bottle, there was no cloud, but when you let go, the cloud appeared. The water was forming clouds around the ash particles. Pretty cool.