People place wet dishes upside down, with the open end facing down, while they dry for several reasons:
Drain Water: Placing dishes upside down allows any remaining water or moisture to drain off the dishes. Gravity pulls the water down to the bottom of the dish, which helps to speed up the drying process and prevents water from pooling on the surface.
Prevent Water Spots: Drying dishes upside down helps to prevent water spots and streaks from forming on the surface. When dishes dry right side up, any remaining water may evaporate and leave behind mineral deposits, especially if the water is hard (contains high levels of minerals).
Hygiene: By placing dishes upside down, the part of the dish that comes into contact with your mouth or food is exposed to the air, which may be considered more hygienic than letting the bottom of the dish dry against a potentially less clean surface.
Avoid Contamination: Drying dishes upside down on a clean and dry dish rack or drying mat can help avoid contamination. Placing the dishes upside down creates a barrier between the surface and the part of the dish that is used for eating or drinking, reducing the risk of picking up any potential contaminants from the surface.
Even Drying: Drying dishes upside down allows air to circulate more freely around the dishes, leading to more even and faster drying.
Stability: Cups and glasses are more stable when placed upside down, reducing the risk of them tipping over and breaking during the drying process.
It's important to note that the effectiveness of this method may vary depending on the dish's material and the surrounding humidity levels. Additionally, ensuring that your dish rack or drying surface is clean and free from any residues can further improve the drying process.