Can you have airlock activity without fermentation?

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petep1980

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Just curious. I always see just because you have no activity it doesn't mean there is no fermentation. Does it work inversely?
 
If your wort is colder than the ambient temperature in the room, as it warms up, you might see some airlock activity that isn't a result of fermentation.
 
Changes in temperature (of the beer or ambient air) or atmospheric pressure can lead to airlock activity - and not only out, you could get suck-back.
 
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