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20.271 K: −252.879 °C: −423.182 °F ... Values are in kelvin K and degrees Celsius ... all values refer to the normal boiling point at standard pressure (101.325 ...
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). Its boiling point and critical point depend on which isotope of helium is present: the common isotope helium-4 or the rare isotope helium-3. These are the only two stable isotopes of helium.
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.
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 ...
Boiling point (°C) K b (°C⋅kg/mol) Freezing point (°C) ... –20.2 Diethyl ether: 0.713 34.5 2.16 ... K f [2] K b [1] Water: 100.00 0.512 0.00
14.01 K, melting point of bound hydrogen; 20.28 K, boiling point of bound hydrogen; 33 K, critical temperature of hydrogen; 44 K mean on Pluto; 53 K mean of Neptune; 63 K, melting point of bound nitrogen; 68 K mean of Uranus; 77.35 K, boiling point of bound nitrogen; 90.19 K, boiling point of bound oxygen; 92 K, superconductivity point of Y ...
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)
Similar cooling of helium-3, which has a lower boiling point, can achieve about 0.2 kelvin in a helium-3 refrigerator. Equal mixtures of liquid 3 He and 4 He below 0.8 K separate into two immiscible phases due to their dissimilarity (they follow different quantum statistics: helium-4 atoms are bosons while helium-3 atoms are fermions). [30]