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Humidity - water vapor mixed with air - is drawn to the coolest surfaces, like windows. Cool air can't hold as much moisture as warm air so windows often collect this moisture and make it visible.

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Q: Why does moisture appear on window panes?
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What substannce makes a window fog up?

It is the moisture leaking through the seal of the window. The moisture collects between the window panes and makes the glass fog up. I do not know how i can fix it. I think you just have to buy an all new window.


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Why do windows fog up inside window panes?

I assume you are referring to double-pane windows, which are constructed by using two panes of glass separated by a space. The frame in which the panes are held is sealed (sometimes, an innert gas is used to fill the space between the panes as a way of limiting ultraviolet radiation penetration), and is airtight. If that seal is broken, air from outside the panes can enter the space between the panes of glass. This will result in the gradual introduction of moisture into the space. The amount of moisture will not be substantial at first, because there won't be much exchange of air from the space between glass panes and the outside unless there is a fairly substantial breach of the seal. That would usually require some substantial force, and would likely break the glass, anyway. Because there is virtually no regular circulation of air between panes (even if the seal is eroded in some spot), any moisture that gets between the glass will stay there. Furthermore, since there is (now) a breach in the seal, heat will cause the air between the panes to expand and cooling will cause the air to contract. This will keep a regular supply of moisture entering the space between the panes. The fog results from the moisture condensing on the glass in the space between the panes. When a seal is breached, you will first notice just a small bit of moisture , and that will usually be localized to the area of the breach, spreading out over time. This process takes years before you have a large portion of the window fogged. At its worse, the real issue is not the vapor itself (although it will eventually block your view in or out of the window), but the introduction of mold spores or other microorganisms which will grow in the nice, moist environment. (A neighbor of mine let this process get so bad that the entire window was coated with mold.) There is no way to repair this problem - the seal, once broken, has already introduced moisture which cannot be effectively removed. the pane must be replaced.


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