翻訳と辞書 Words near each other ・ Lambert High School ・ Lambert Hillyer ・ Lambert Hitchcock ・ Lambert House ・ Lambert House (Monticello, Arkansas) ・ Lambert I ・ Lambert I (bishop of Langres) ・ Lambert I of Nantes ・ Lambda Pi Chi ・ Lambda Pi Eta ・ Lambda Pi Upsilon ・ Lambda Pictoris ・ Lambda Piscis Austrini ・ Lambda Piscium ・ Lambda point ・ Lambda point refrigerator ・ Lambda Psi Delta ・ Lambda Pyxidis ・ Lambda Rising ・ Lambda Sagittarii ・ Lambda School of Music and Fine Arts ・ Lambda Scorpii ・ Lambda Sculptoris ・ Lambda Serpentis ・ Lambda Sigma ・ Lambda Sigma Gamma ・ Lambda Sigma Upsilon ・ Lambda Tau Omega ・ Lambda Tauri ・ Lambda Telescopii Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Lambda point refrigerator ： ウィキペディア英語版 Lambda point refrigerator A lambda point refrigerator is a device used to cool liquid helium, typically around a superconducting magnet or for low temperature measurements, from approximately 4.2 K to temperatures near the lambda point of helium (approximately 2.17 K), the temperature at which normal fluid helium (helium I) transitions to the superfluid helium II. Cooling is achieved by pumping the liquid helium in the bath through a cooling coil via a needle valve and vacuum pump. The reduced pressure in the coil causes some of the helium to evaporate, creating a two-phase system within the cooling coil. The heat removed via evaporation lowers the temperature of the cooling coil closer to the lambda point. Since the cooling coil is immersed in the liquid helium bath, liquid surrounding the coil is also cooled. The colder, higher density liquid sinks away from the coil toward the bottom of the bath while the warmer, lower density liquid helium rises to the top. Liquid helium typically has poor thermal conductivity, so convective currents associated with a temperature gradient in the bath provide a constant flow of this colder liquid helium toward the bottom of the bath, allowing temperatures below 4.2 K to be realized in the helium bath, typically close to 2.2 K. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Lambda point refrigerator」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.