Living · 6 pages · 12 min
Why condensation forms on a cold window
Room air meets glass colder than its dew point, and vapor becomes liquid.
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From the opening
Condensation forms on a cold window when water vapor in room air touches glass colder than that air's dew point. The vapor leaves the air and becomes liquid on the pane, so the window did not leak the water in and the air was already holding it. The opening covers dew point on a cold pane, where the vapor usually comes from, and why a single pane wets sooner.
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Inside
- Dew point on a cold pane
- Where the vapor usually comes from
- Why a single pane wets sooner
- Water between panes is different
- Where the idea stops applying
- A distinction worth keeping
Sources
- Dew point and surface condensation
- Indoor humidity meeting cold glazing