
1) Laboratory glassware
Found on
https://www.crosswordclues.com/clue/cold-trap

In vacuum applications, a cold trap is a device that condenses all vapors except the permanent gases into a liquid or solid. The most common objective is to prevent vapors being evacuated from an experiment from entering a vacuum pump where they would condense and contaminate it. Particularly large cold traps are necessary when removing large amou...
Found on
http://en.wikipedia.org/wiki/Cold_trap
[astronomy] In astronomy, a cold trap is a close to the surface layer of the atmosphere that is substantially colder than both the deeper and higher layers. It is called a trap because it keeps ascending gases with high melting points in by freezing them to a solid which then drops back to the planet surface. The most important gas to be ke...
Found on
http://en.wikipedia.org/wiki/Cold_trap_(astronomy)
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