Introduction to Liquid Helium - NASA
2014年9月11日 · Liquid helium, because of its low boiling point, is used in many cryogenic systems when temperatures below the boiling point of nitrogen are needed. A convenient way to cool many kinds of apparatus is to submerge …
Helium | Definition, Properties, Uses, & Facts | Britannica
- helium (He), chemical element, inert gas of Group 18 (noble gases) of the periodic table. The second lightest element (only hydrogen is lighter), helium is a colourless, odourless, and tasteless gas that becomes liquid at −268.9 °C (−452 °F). The boiling and freezing points of helium are lower than those of any other known substance. Helium is the ...
- 发布日期: 1998年7月20日
Liquid helium - Vocab, Definition, and Must Know Facts - Fiveable
Liquid helium is a unique state of helium that occurs at extremely low temperatures, specifically below its boiling point of approximately 4.2 K (-268.95 °C). This state exhibits …
Liquid helium is typically shipped from production sources to storage and transfill facilities. Tankers, ranging in size from 5,000 to 11,000 gallons, contain an annular space insulated with …
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Helium - Wikipedia
Helium remains liquid down to absolute zero at atmospheric pressure, but it freezes at high pressure. Solid helium requires a temperature of 1–1.5 K (about −272 °C or −457 °F) at about 25 bar (2.5 MPa) of pressure. [106] It is often …
Liquid Helium - an overview | ScienceDirect Topics
Liquid Helium refers to a strongly correlated quantum fluid that has been extensively studied in the field of physics. It is known for its unique physical properties and has served as a …
Liquid helium - (Thermodynamics of Fluids) - Fiveable
Liquid helium is a low-temperature liquid formed when helium gas is cooled to below its boiling point of approximately 4.2 Kelvin (-268.95 degrees Celsius). This state of helium exhibits …
Introduction to Liquid Helium in Space, Part 2 - NASA
2014年9月11日 · On these satellites, liquid helium was used to cool sensors which measured infrared radiation. Infrared radiation is sometimes called "heat radiation". Warm objects (including people) give off measurable amounts of …
Electronic rotons and Wigner crystallites in a two-dimensional …
22 小时之前 · A key concept proposed by Landau to explain superfluid liquid helium is the elementary excitation of quantum particles called rotons 1,2,3,4,5,6,7,8.The irregular …
