Cold finger: Difference between revisions
Content deleted Content added
Thumperward (talk | contribs) stubify |
+ wiki link to Cold trap |
||
| Line 1: | Line 1: | ||
[[Image:cold_fingers.svg|thumb|right|Cold fingers.]] |
[[Image:cold_fingers.svg|thumb|right|Cold fingers.]] |
||
A '''cold finger''' is a piece of [[laboratory equipment]] that is used to generate a localized cold surface. It is named for its resemblance to a [[finger]]. |
A '''cold finger''' is a piece of [[laboratory equipment]] that is used to generate a localized cold surface. It is named for its resemblance to a [[finger]] as is a type of [[cold trap]]. |
||
Typically a cold finger is used in a [[Sublimation (physics) |sublimation]] apparatus, or can be used as compact version of a [[condenser]] in either [[reflux]] reaction or [[distillation]] apparatus. |
Typically a cold finger is used in a [[Sublimation (physics) |sublimation]] apparatus, or can be used as compact version of a [[condenser]] in either [[reflux]] reaction or [[distillation]] apparatus. |
||
Revision as of 23:29, 8 October 2009
A cold finger is a piece of laboratory equipment that is used to generate a localized cold surface. It is named for its resemblance to a finger as is a type of cold trap.
Typically a cold finger is used in a sublimation apparatus, or can be used as compact version of a condenser in either reflux reaction or distillation apparatus.
The device usually consists of a chamber in which a liquid (typically cold tap water) can enter and leave. Another version involves filling the device with a cold solid such as ice, or dry ice.
Media
-
Dark green crystals of nickelocene, freshly sublimed on a cold finger. -
Camphor being sublimed. Note the white purified camphor on the cold finger, and the dark-brown crude product. -
A cold finger which includes a vacuum outlet. -
Cold finger used in sublimation
 | This chemistry-related article is a stub. You can help Wikipedia by expanding it. |