cross section through a Kjehldahl flask
<a href="//commons.wikimedia.org/w/index.php?title=User:Talos&amp;action=edit&amp;redlink=1" class="new" title="User:Talos (page does not exist)">Joël Gubler</a>
2006-03-30
<span class="int-own-work" lang="en">Own work</span>