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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).
2 He helium; use: 0.0829 ... Values refer to the enthalpy change in the conversion of liquid to gas at the boiling point ... "Corrected Values for Boiling Points and ...
Boca Raton, Florida, 2003; Section 6, Fluid Properties; Critical Constants. 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 Tc and Pc is indicated by the number of digits.
This is a list of the various reported boiling points for the elements, with recommended values to be used elsewhere on Wikipedia. ... 2 He helium; use: 4.222 K: − ...
The temperature at standard pressure should be equal to the normal boiling point, but due to the considerable spread does not necessarily have to match values reported elsewhere. log refers to log base 10 (T/K) refers to temperature in Kelvin (K) (P/Pa) refers to pressure in Pascal (Pa)
The Canada-based Pulsar said Thursday 11 samples sent to a pair of labs measured helium contents of up to 13.8%, far above what CEO Tom Abraham-James said is a 0.3% threshold for when helium ...
2 He helium-4; Hoffer et al. 0.19085 ... (He-I at boiling point: 4.222 K) ... The suggested values for liquid densities refer to "at the melting point (m.p.)" by default.
2 He helium; use: 0.0138 LNG: 0.0138 ... Values refer to the enthalpy change between the liquid phase and the most stable solid phase at the melting point (normal ...