Which of the following is NOT a driving force that can bring radon into a home?

Evaporation is not a driving force that brings radon into a home. Radon gas primarily originates from the natural decay of uranium in the soil and can enter buildings through various mechanisms. These include diffusion, where radon moves from areas of high concentration (like soil beneath a house) to lower concentration areas (like the air inside the house), and emanation, which involves radon being released from soil and rock directly into the air.

Additionally, well water can contribute to radon exposure when it is used for drinking or bathing, since radon can dissolve in water and be released into the air when water is used. In contrast, evaporation does not act as a mechanism to transfer radon from soil or rock into the home environment but is more associated with the transition of liquids into vapor. Therefore, it does not function as a means of radon entry into residential spaces.