Sulaiman - 6-8-2016 at 10:38
As part of a job lot of used glassware I have a claisen-flask with a (presumed) vacuum jacket where you often find a mini-vigreaux column.
I can't get to it at the moment so a Paint sketch
![Untitled.jpg - 7kB Untitled.jpg - 7kB](https://www.sciencemadness.org/whisper/files.php?pid=457085&aid=52474)
is there a specific temperature range where this is useful ?
BromicAcid - 6-8-2016 at 17:45
Likely an area that could be filled with saddles, helices, etc, to make a packed column.
Deathunter88 - 6-8-2016 at 19:51
Heat can only be lost through a vacuum through radiation. Thus it stops heat loss through conduction and convection. It's basically insulating that
part of the glassware, similar to how a vacuum thermos works.