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The density of liquid helium-4 at its boiling point and a pressure of one atmosphere (101.3 kilopascals) is about 125 g/L (0.125 g/ml), or about one-eighth the density of liquid water. [ 1 ] Liquefaction
2 He helium; use: 4.222 K: −268.928 °C: ... "Corrected Values for Boiling Points and Enthalpies of Vaporization of Elements in ... Melting points of the elements ...
Liquid helium-4 can be cooled to about 1 K (−272.15 °C; −457.87 °F) using evaporative cooling in a 1-K pot. 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
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.
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: 0.0829 ... Values refer to the enthalpy change in the conversion of liquid to gas at the boiling point ... "Corrected Values for Boiling Points and ...
Gradually add about two to three cups of liquid to the roux, a little at a time as you whisk continuously to incorporate. Keep whisking briskly, because it helps break up any lumps immediately."
This Wikipedia page provides a comprehensive list of boiling and freezing points for various solvents.