To expose to circulating air
Fall is also the time to aerate if you have a half inch or more of thatch built up.
This is helpful because it means you won't be stepping in the beds, which compacts the soil and requires more digging in the fall or spring to aerate the soil again.
German glassmaker Eisch has introduced a "breathable" crystal stemware with a special molecular glass structure designed to aerate the wine right in the glass.
They build up nutrients in the soil, make it healthier, add organic matter, help aerate the soil, and make it easier for roots to grow.
When you're baking cakes and other light-textured items and using organic all-purpose flour instead of cake flour, make sure to sift and aerate the flour as much as possible.