#physical process

• Aeration — The act of aerating and its result; a physical, mechanical, or biological process through which a space, a liquid (such as wastewater in treatment plants), or a solid (such as agricultural soil) is enriched with air or atmospheric oxygen to stimulate oxidative processes, eliminate parasitic gases, and improve structural quality.
• Sinking — The act of sinking or submerging and its result; the physical process of a body lowering below a liquid surface or inside soft soil; the structural sagging or settling of a building or ground under heavy weight or foundation failure.