That Dinkum ThinkumFeb 20
I have a question for all the geeks out there: What kind of weather phenomenon creates this pattern on my window? It happens always when it’s below freezing and dry. It only happens on this window, which has no side wall to protect it from... what exactly?
Show threadTsehHaEssMar 4
@bigz Theory: The window would freeze in a full, round (slightly oval) circle because of its thermodynamic symmetry inside and outside, but there is some kind of heat source centered beneath the window (not shown in the picture) which causes the center of the circle to vanish? 🤔
Show threadTsehHaEss
@bigz Oh, hold on! I got it!
Theory:
The corners of the window: warm (because of the contact with the isolated, warm walls)
The centre of the window: also warm, because of the warm room air.
The frozen circle correlates and manifests itself due to the thickness of the walls, which cause the room air to get less in touch with the areas of the window, exactly where the window freezes!
Mar 4 at 11:31amWeb
Show threadThat Dinkum ThinkumMar 4
@TsehHaEss Agree with the thermal contact with the walls. However, the inside of the ring cannot have anything (directly) to do with the inside of the house, as the window is double glazed…
Show threadTsehHaEssMar 4
@bigz Let's assume, it does have something to do with the inside if the house. What could explain the occurance of the "hole" in the freezing zone? Presumably a defect (not perfect isolation) of the double-glas window?