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Very interesting. I'm intrigued to know if anybody with experience knows why there is a common recommendation of warming the mineral oil, versus room temperatu
by tenpaiyomi 7y ago
Very interesting. I'm intrigued to know if anybody with experience knows why there is a common recommendation of warming the mineral oil, versus room temperature which the author did.
- dvt 7y agoAuthor here. Would also love to know if any chemist/physicist knows the definitive answer to this :) Also: why do some watches purposefully leave an air bubble in the watch? Is this an aesthetic choice or is there any benefit/detriment to it?
- monochromatic 7y agoCould be to help drive out any dissolved gases.
- deleted 7y ago[deleted]
- jacobush 7y agoMaybe a de facto expansion reservoir?
- michelpp 7y agoNo experience here. But my guess is warming the oil makes it less viscous and thus easier for small air bubbles to escape.
- semi-extrinsic 7y agoTo be precise, warming makes the oil exponentially less viscous, so it can be a really pronounced effect by warming it 30 degrees (depending on the specific oil).
- lwhsiao 7y agoMy guess would be that in addition to the viscosity, it preemptively compensates for the thermal expansion of the oil, since on your wrist will likely be warmer than room temperature. Here is another detailed liquid-filled watch guide [0], which talks more about handling thermal expansion, where rather than using an air bubble, he opts for some sort of foam ring. Another person recommends Flourinert with foam rather than mineral oil [1]. [0]: https://www.christopherwardforum.com/viewtopic.php?f=5&t=4960 https://www.christopherwardforum.com/viewtopic.php?f=5&t=496... [1]: https://forums.watchuseek.com/f21/liquid-filled-citizen-654085.html https://forums.watchuseek.com/f21/liquid-filled-citizen-6540...