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Lambda Point
The lambda point is the temperature at which normal fluid helium (helium I) makes the transition to superfluid state ( helium II). At pressure of 1 atmosphere, the transition occurs at approximately 2.17 K. The lowest pressure at which He-I and He-II can coexist is the vapor−He-I−He-II triple point at and , which is the "saturated vapor pressure" at that temperature (pure helium gas in thermal equilibrium over the liquid surface, in a hermetic container). The highest pressure at which He-I and He-II can coexist is the bcc−He-I−He-II triple point with a helium solid at , . The point's name derives from the graph (pictured) that results from plotting the specific heat capacity as a function of temperature (for a given pressure in the above range, in the example shown, at 1 atmosphere), which resembles the Greek letter lambda \lambda. The specific heat capacity has a sharp peak as the temperature approaches the lambda point. The tip of the peak is so sharp that a critical ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Lambda Transition
The ''λ'' (lambda) universality class is a group in condensed matter physics. It regroups several systems possessing strong analogies, namely, superfluids, superconductors and smectics (liquid crystals). All these systems are expected to belong to the same universality class for the thermodynamic critical properties of the phase transition. While these systems are quite different at the first glance, they all are described by similar formalisms and their typical phase diagrams are identical. See also * Superfluid * Superconductor * Liquid crystal * Phase transition * Renormalization group In theoretical physics, the renormalization group (RG) is a formal apparatus that allows systematic investigation of the changes of a physical system as viewed at different scales. In particle physics, it reflects the changes in the underlying p ... * Topological defect References Books * Chaikin P. M. and Lubensky T. C. ''Principles of Condensed Matter Physics'' (Cambridge Univ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Greek Language
Greek (, ; , ) is an Indo-European languages, Indo-European language, constituting an independent Hellenic languages, Hellenic branch within the Indo-European language family. It is native to Greece, Cyprus, Italy (in Calabria and Salento), southern Albania, and other regions of the Balkans, Caucasus, the Black Sea coast, Asia Minor, and the Eastern Mediterranean. It has the list of languages by first written accounts, longest documented history of any Indo-European language, spanning at least 3,400 years of written records. Its writing system is the Greek alphabet, which has been used for approximately 2,800 years; previously, Greek was recorded in writing systems such as Linear B and the Cypriot syllabary. The Greek language holds a very important place in the history of the Western world. Beginning with the epics of Homer, ancient Greek literature includes many works of lasting importance in the European canon. Greek is also the language in which many of the foundational texts ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Threshold Temperatures
Threshold may refer to: Science Biology * Threshold (reference value) * Absolute threshold * Absolute threshold of hearing * Action potential * Aerobic threshold * Anaerobic threshold * Dark adaptation threshold * wiktionary:Epidemic threshold, Epidemic threshold * Flicker fusion threshold * Masking threshold * Odor detection threshold * Renal threshold * Seizure threshold * Sensory threshold * Threshold expression * Threshold limit value * Threshold model * Threshold of pain * Threshold potential Other science-related * Ecological threshold * Error threshold (evolution) * Extinction threshold * Lasing threshold * Percolation threshold * Polygyny threshold model * Threshold cryptosystem * Threshold displacement energy * Threshold energy * Threshold graph * Threshold knowledge * Threshold model * Threshold voltage * Thresholding (image processing) * Transparency threshold Architecture * Threshold (architecture), the sill of a door Literature * Threshold (1990 novel), ''Thre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
