"aeration" is the process of mixing air with another substance, which doesn't necessarily happen stoßweise
- This patient, a young woman, had obtained her nitrous oxide from cartridges of nitrous oxide used to aerate cream.
- We've put pumps in to aerate the water and feed back oxygen into the dam for the fish to survive.
- He must be aerating the soil, the blessed man.
"airing", as Mike says, usually refers to letting fresh air into a room, but can also mean exposing clothing/laundry/bedding to fresh air (or warm air in the case of an airing cupboard) to rid it of dampness or bad odours.
- Apparently, the covenants of our homeowners association forbid the airing of laundry outside.
- Vacuum curtains once in a while and give the sheets an airing as often as you can.
- When the sun shone we liked to give our blankets a good airing.