Matches in DBpedia 2016-04 for { <http://dbpedia.org/resource/1-K_pot> ?p ?o }
Showing triples 1 to 30 of
30
with 100 triples per page.
- 1-K_pot abstract "A 1-K pot (i.e. 1-kelvin pot) is a cryogenic device used to attain temperatures down to approximately 1 kelvin.The 1-K pot is a small vessel in a cryogenic system that is filled with liquid helium. Usually it is a few cubic centimeters in size with a pickup-tube extending into the primary liquid helium bath of the dewar. When a vessel containing liquid helium is connected to a vacuum pump, the vapor pressure above the liquid surface drops, thereby allowing the more energetic helium molecules to evaporate out of the liquid. As the particles evaporate and are pumped away from the liquid, they carry heat energy with them, so the remaining fluid tends to cool. This technique is known as evaporative cooling.At atmospheric pressure, 4He (the more abundant isotope of helium) liquefies at 4.2 K. By employing evaporative cooling, temperatures down to 1 K can be easily produced. While this technique is fairly simple to operate, it is inefficient for large helium baths because about 50% of the liquid helium must evaporate to attain to the lowest temperatures. If only a small volume needs to be cooled to 1 K, the 1-K pot is used. Only the surface of the small 1-K pot is pumped, leaving the rest of the liquid helium bath at atmospheric pressure.While this method is commonly used in simple cryogenic systems to cool objects down to 1 K, it is also fairly popular in more complicated cryogenic systems to bootstrap to lower temperatures. For example, in a 3He refrigerator, condensed 3He (a rare isotope of helium) is evaporatively cooled and can attain temperatures as low as 200 mK. But the 3He must be condensed to a liquid first, and a 1-K pot is typically used for this purpose.Another example is a dilution refrigerator, where a mixture of 3He and 4He forms a phase boundary in a mixing chamber and can cool down to a few millikelvins. Dilution refrigerators typically use a 1-K pot to condense the 3He/4He mixture.".
- 1-K_pot wikiPageID "1720042".
- 1-K_pot wikiPageLength "2199".
- 1-K_pot wikiPageOutDegree "13".
- 1-K_pot wikiPageRevisionID "606969237".
- 1-K_pot wikiPageWikiLink Bootstrapping.
- 1-K_pot wikiPageWikiLink Category:Cryogenics.
- 1-K_pot wikiPageWikiLink Cryogenics.
- 1-K_pot wikiPageWikiLink Dilution_refrigerator.
- 1-K_pot wikiPageWikiLink Evaporative_cooler.
- 1-K_pot wikiPageWikiLink Helium-3.
- 1-K_pot wikiPageWikiLink Helium-3_refrigerator.
- 1-K_pot wikiPageWikiLink Helium-4.
- 1-K_pot wikiPageWikiLink Isotope.
- 1-K_pot wikiPageWikiLink Kelvin.
- 1-K_pot wikiPageWikiLink Liquid_helium.
- 1-K_pot wikiPageWikiLink Phase_boundary.
- 1-K_pot wikiPageWikiLink Vacuum_flask.
- 1-K_pot wikiPageWikiLinkText "1-K pot".
- 1-K_pot wikiPageUsesTemplate Template:Unreferenced.
- 1-K_pot subject Category:Cryogenics.
- 1-K_pot hypernym Device.
- 1-K_pot type Device.
- 1-K_pot comment "A 1-K pot (i.e. 1-kelvin pot) is a cryogenic device used to attain temperatures down to approximately 1 kelvin.The 1-K pot is a small vessel in a cryogenic system that is filled with liquid helium. Usually it is a few cubic centimeters in size with a pickup-tube extending into the primary liquid helium bath of the dewar.".
- 1-K_pot label "1-K pot".
- 1-K_pot sameAs Q4545785.
- 1-K_pot sameAs m.05qzr2.
- 1-K_pot sameAs Q4545785.
- 1-K_pot wasDerivedFrom 1-K_pot?oldid=606969237.
- 1-K_pot isPrimaryTopicOf 1-K_pot.