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Liquid helium is a physical state of helium at very low temperatures at standard atmospheric pressures.Liquid helium may show superfluidity.. At standard pressure, the chemical element helium exists in a liquid form only at the extremely low temperature of −269 °C (−452.20 °F; 4.15 K).
Values are in kelvin K and degrees Celsius °C, rounded For the equivalent in degrees Fahrenheit °F, see: Boiling points of the elements (data page) Some values are predictions
Below its boiling point of 4.22 K (−268.93 °C; −452.07 °F) and above the lambda point of 2.1768 K (−270.9732 °C; −455.7518 °F), the isotope helium-4 exists in a normal colorless liquid state, called helium I. [30] Like other cryogenic liquids, helium I boils when it is heated and contracts when its temperature is lowered. Below the ...
1.5 K, melting point of overbound helium; 2.19 K, lambda point of overbound superfluid helium; 2.725 K, cosmic microwave background; 4.1 K, superconductivity point of mercury; 4.22 K, boiling point of bound helium; 5.19 K, critical temperature of helium; 7.2 K, superconductivity point of lead; 9.3 K, superconductivity point of niobium
The element with the lowest boiling point is helium. Both the boiling points of rhenium and tungsten exceed 5000 K at standard pressure; because it is difficult to measure extreme temperatures precisely without bias, both have been cited in the literature as having the higher boiling point. [11]
2 He helium; use: 0.0829 CRC: 0.08 ... 19 K potassium; use: 76.90 ... Values refer to the enthalpy change in the conversion of liquid to gas at the boiling point ...
2 He helium; use (T/K) 3 4 CRC.b (T ... pressure should be equal to the normal boiling point, ... of Argon from the Triple Point to 1200 K with Pressures to 1000 MPa
Also agrees with Celsius values from Section 4: Properties of the Elements and Inorganic Compounds, Melting, Boiling, Triple, and Critical Point Temperatures of the Elements Estimated accuracy for T c and P c is indicated by the number of digits.