A cross-sectional diagram of a <a href="https://en.wikipedia.org/wiki/cold_trap" class="extiw" title="en:cold trap">cold trap</a> immersed in cooling medium in a <a href="https://en.wikipedia.org/wiki/Dewar_flask" class="extiw" title="en:Dewar flask">Dewar flask</a>.
No machine-readable author provided. <a href="//commons.wikimedia.org/wiki/User:H_Padleckas" title="User:H Padleckas">H Padleckas</a> assumed (based on copyright claims).
3 November 2006 (original upload date)
No machine-readable source provided. Own work assumed (based on copyright claims).