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See all on WikipediaSuperfluid helium-4 - Wikipedia
Superfluid helium-4 (helium II or He-II) is the superfluid form of helium-4, an isotope of the element helium. A superfluid is a state of matter in which matter behaves like a fluid with zero viscosity. The substance, which resembles other liquids such as helium I (conventional, non-superfluid liquid helium), flows without … See more
Known as a major facet in the study of quantum hydrodynamics and macroscopic quantum phenomena, the superfluidity effect was discovered by Pyotr Kapitsa and See more
Recently in the field of chemistry, superfluid helium-4 has been successfully used in spectroscopic techniques as a quantum solvent. … See more
Thermodynamics
Figure 1 is the phase diagram of He. It is a pressure-temperature (p-T) diagram indicating the solid … See more
Superfluids, such as helium-4 below the lambda point, exhibit many unusual properties. A superfluid acts as if it were a mixture of a normal component, with all the properties of a … See more
Landau two-fluid approach
L. D. Landau's phenomenological and semi-microscopic theory of superfluidity of helium-4 earned him … See more• Antony M. Guénault: Basic superfluids. Taylor & Francis, London 2003, ISBN 0-7484-0891-6
• D.R. … See moreWikipedia text under CC-BY-SA license Superfluidity - Wikipedia
Superfluidity is the characteristic property of a fluid with zero viscosity which therefore flows without any loss of kinetic energy. When stirred, a superfluid forms vortices that continue to rotate indefinitely. Superfluidity occurs in two isotopes of helium (helium-3 and helium-4) when they are liquefied by cooling to cryogenic temperatures. It is also a property of various other exotic states of matter
Wikipedia · Text under CC-BY-SA license- Estimated Reading Time: 8 mins
A brief account of the physics of superfluid 4He, with emphasis on the underlying physical principles and their connection with Bose condensation and superconductivity. The document …
Secrets of superfluid helium explored | Department of Physics
Jul 7, 2017 · Using a nanofabricated torsion pendulum, they observed the A and B phases of superfluid helium-3 and found a new supercooling effect. They also suggested that …
Superfluid Helium - MIT
Key differences of helium superfluidity and BEC: Interactions: He-II is a practically incompressible liquid due to hard-core interactions, while the ideal BEC has no compressibility! Differences in …
Superfluidity: the mysterious quantum effect that …
Feb 14, 2024 · The strange properties of superfluid helium-4 (also known as liquid helium II) arise because of the quantum rules governing the symmetry of the wave functions of helium atoms. Electrons, which are fermions, cannot occupy …
Helium-4 - Wikipedia
Helium-4 makes up about one quarter of the ordinary matter in the universe by mass, with almost all of the rest being hydrogen. When liquid helium-4 is cooled to below 2.17 K (−270.98 °C), it becomes a superfluid, with properties that are …
Eighty years of superfluidity - Nature
Jan 15, 2018 · Eighty years of superfluidity. In 1938, two studies demonstrated that liquid helium-4 flows without friction or viscosity at temperatures close to absolute zero. The finding led to major advances...
Secrets of superfluid helium explored | Cornell Chronicle
Jul 7, 2017 · Using a nanofabricated torsion pendulum, the team observed the A and B phases of superfluid helium-3 and found a new supercooling effect. They also investigated the role of …
Wild Experiment Reveals What Would Happen if You Touched a …
Nov 2, 2023 · An experiment has finally revealed how it might feel to touch a quantum superfluid. Physicists dunked a special, finger-sized probe into an isotope of helium cooled to just a smidge over absolute zero, and recorded the physical properties therein.
Liquid helium, superfluidity - HyperPhysics
Learn about the properties and applications of liquid helium, a superfluid that forms at 2.17 K. Explore the lambda point, the two-fluid model, and the Bose-Einstein condensation of helium …
Superfluidity | Physics of Low-Temperature Fluids | Britannica
Learn about the frictionless flow and other exotic behaviour of liquid helium at very low temperatures, and the connection with superconductivity. Explore the discovery, properties, …
Touching Quantum Physics With Superfluid Helium 3He
Nov 8, 2023 · What Does Superfluid Helium Feels Like? An experiment has offered insights into the sensation of touching a quantum superfluid. Scientists submerged a specially designed …
Theory for superfluid helium confirmed - ScienceDaily
Jul 17, 2023 · A new study of vortex ring motion in superfluid helium provides crucial evidence supporting a recently developed theoretical model of quantized vortices.
liqUid helium is a rewarding subject for the study of thermodynamic properties, especially because helium II, the lower temperature phase, exhibits the property of superfluidity. The …
Superfluidity Definition and Examples - Science Notes and Projects
Feb 9, 2022 · Superfluid helium-4 is the best studies example of superfluidity. Helium-4 transitions from a liquid into a superfluid just a few degrees below its boiling point of -452 °F (-269 °C or 4 …
Looking Inside the Superfluid Helium-3 Universe - Physics
May 25, 2022 · When liquid helium-3 is cooled to millikelvin temperatures, it transitions into a state of matter called a superfluid. From the outside, superfluid helium-3 looks like a simple, …
Revisiting Thomson's model with multiply charged superfluid …
19 hours ago · We study superfluid helium droplets multiply charged with ions. When stable, the charges are found to reside in equilibrium close to the droplet surface, thus representing a …
Shapes and vorticities of superfluid helium nanodroplets
Aug 22, 2014 · Helium nanodroplets are considered ideal model systems to explore quantum hydrodynamics in self-contained, isolated superfluids. However, exploring the dynamic properties of individual droplets is experimentally challenging.
The Slightest Splash of Superfluid? - Physics
Oct 15, 2003 · When liquid helium is cooled to within a couple of degrees of absolute zero, it flows without any friction or viscosity. Known as superfluidity, the phenomenon allows the liquid to …
Phys. Rev. Fluids 6, 044702 (2021) - Physics of superfluid helium …
Apr 21, 2021 · Although normal-fluid vorticity tends to induce homogeneous, chaotic, quantum-vortex tangles, normal-fluid strain generates structured superfluid vorticity. In extensional …
Suprafluidität – Wikipedia
Das Phänomen der Suprafluidität wurde bislang nur bei den Helium-Isotopen 4 He und 3 He sowie in diversen Quantengasen wie 6 Li beobachtet. Sie gehen in den suprafluiden Zustand …
Quantum boost for a classical cooling technology: new material …
Apr 12, 2021 · Reaching temperatures close to absolute zero has been possible since decades using the so-called dilution refrigeration where a mixture of helium isotopes is employed in a …
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