At its heart, the Wet Scrubber Working Principle relies on intimate contact. Polluted air stream is brought into violent contact with a fine mist or liquid sheet. Particulate matter cannot navigate this dense, wet obstacle course; it collides with droplets (impaction) and is entrained. Soluble gases, like SO2, dissolve directly into the liquid (absorption). This forced marriage of dirty gas and clean liquid is the simple, mechanical heart of the "rainforest in a pipe," where contamination is washed from the air.