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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.
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 ...
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.
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 ...
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
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)
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 ...