Condensation gets into a watch primarily when humid air containing water vapor encounters the cooler internal environment and crystal of the watch. This temperature difference causes the water vapor to condense into liquid droplets.
Here's a more detailed breakdown:
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Temperature Difference: The watch crystal, being on the exterior, can cool down relatively quickly, especially in colder environments. When warm, humid air comes into contact with this cool surface, it triggers condensation.
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Water Vapor Source: The moisture comes from the surrounding air. Humid environments, sweating, or even a sudden change in temperature (like going from a warm room to a cold outdoor environment) can introduce enough moisture.
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Entry Points: Condensation inside the watch implies that the watch is not completely sealed. Potential entry points include:
- Damaged or worn seals (gaskets): These seals around the crystal, case back, crown, and pushers are meant to prevent water ingress. Over time, they can degrade, crack, or become displaced, creating pathways for moisture.
- Loose crown: The crown (the knob used to set the time) is a common entry point if not properly tightened or if its seals are compromised.
- Cracked crystal: Even a hairline crack in the crystal can allow moisture to seep in.
- Improperly closed case back: After a battery change or repair, if the case back isn't properly sealed, it creates a weak point.
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The Condensation Process: Once humid air enters the watch, the cooler crystal causes the water vapor in the air to change from a gas to a liquid, forming visible droplets on the inside surface of the crystal.
What to do if you see condensation inside your watch:
- Don't Ignore It: Condensation is a sign that your watch's water resistance is compromised.
- Seek Professional Help: Take your watch to a qualified watchmaker as soon as possible. They can identify the source of the leak, replace the seals, and dehumidify the watch to prevent further damage to the movement.
- Avoid further exposure to moisture: Until the watch is serviced, avoid wearing it in humid conditions or exposing it to water.
