liquid helium temperature

Key to the effect is helium's unique ability to remain liquid down to absolute zero (–459.67 degrees F, or –273.15 degrees C), the temperature at which atoms theoretically stop moving. Liquid helium is a colorless, nontoxic liquid with a density of one-eighth that of water, inert under all temperature and pressure conditions. The most important property of helium II is superfluidity: mass flow without viscous friction. The Dewar used in these experiments had a fill tube with a temperature gradient from 4° to 76° K. One might erroneously speculate that if a con tainer is filled wi th liquid hrjium to a greater level than that corresponding to the critical density, the liquid Reprinted from: "Compressibility Factor for Helium", Data Sheet 11.001 in A Compendium of the Properties of Materials at Low Temperature (Pnese 11) by the National Bureau of Standards, Cryogenic Engineering Laboratory, R. E. Stewart and V. J. Johnson, Pressure-internal ene1'gy diagram Jar helium, a to 100 psia. Cool it even further and it becomes a state of matter called a superfluid. Beyond that, there’s significant benefit to be derived from using liquid helium for cryogenic treatment of metals. Liquid helium then transfers heat away from superconductors. Without the presence of liquid helium, MRI machines would overheat and stop working. At -269°C, helium gas condenses to become a liquid. The boiling and freezing points of helium are lower than those of any other known substance. If the temperature of liquid helium is cooled below the critical value of T λ = 2.1768 K (at saturated vapour pressure), the liquid becomes a quantum fluid called helium II. Liquid helium has the lowest known temperature when it is in its liquid state, making it efficient and preferred cooling agent. In addition to this, the military utilizes liquid helium … During the first stage, some 10,000 tonnes of liquid nitrogen are used in heat exchangers in the refrigerating equipment to bring the temperature of the helium down to 80 K. The helium is then cooled to 4.5 K (-268.7°C) using turbines. Liquid helium exists at very low temperatures - (453°F, -269°C) at atmospheric pressures, a temperature that is only a few degrees above absolute zero. Nm3 (normal cubic meter) gas measured at 1 atmosphere and 0°C . The most notable example is that of CERN’s Large Hadron Collider, which uses 96 metric tons of liquid helium to maintain the temperature at 1.9K. The second lightest element, helium is a colorless, odorless, and tasteless gas that becomes liquid at -268.9 degrees Celsius. Helium, chemical element, inert gas of Group 18 (noble gases) of the periodic table. 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