4 ms·
I noticed those gaps in the thread of a thermos (vacuum flask) last week. Presumably it’s to vent inward airflow when cooled liquid creates a vacuum.
by wombatmobile 5y ago
I noticed those gaps in the thread of a thermos (vacuum flask) last week. Presumably it’s to vent inward airflow when cooled liquid creates a vacuum.
- neur4lnet 5y agoAlso, many thermos flasks have a feature whereby you can pour out the contents without unscrewing the lid all the way, so there will be a large channel interrupting the threads to allow liquid out, and one or more opposing interruptions to let air in.