In its most basic form, a cloud chamber is a sealed environment containing a condensation nuclei, around which a mist will form ( because the mixture is on the point of condensation ).
2.
:As was mentioned before, it can be more humid in the kitchen than the rest of the house, and it doesn't need to get to the point of condensation to promote mold.
3.
When there is mechanical lift to saturation, cloud base begins at the lifted condensation level ( LCL ); absent forcing, cloud base begins at the convective condensation level ( CCL ) where heating from below causes spontaneous buoyant lifting to the point of condensation when the convective temperature is reached.