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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).
At higher temperatures, helium will solidify with sufficient pressure. At room temperature, this requires about 114,000 atm. [111] Helium-4 and helium-3 both form several crystalline solid phases, all requiring at least 25 bar.
A Assuming an altitude of 194 metres above mean sea level (the worldwide median altitude of human habitation), an indoor temperature of 23 °C, a dewpoint of 9 °C (40.85% relative humidity), and 760 mmHg sea level–corrected barometric pressure (molar water vapor content = 1.16%). B Calculated values *Derived data by calculation.
3 Thermal velocity at room temperature. ... indirectly, thermal velocity is a measure of temperature. ... Helium: 1,245 m/s (4,080 ft/s)
For many solids composed of relatively heavy atoms (atomic number > iron), at non-cryogenic temperatures, the heat capacity at room temperature approaches 3R = 24.94 joules per kelvin per mole of atoms (Dulong–Petit law, R is the gas constant).
For a diatomic gas, often 5 degrees of freedom are assumed to contribute at room temperature since each molecule has 3 translational and 2 rotational degrees of freedom, and the single vibrational degree of freedom is often not included since vibrations are often not thermally active except at high temperatures, as predicted by quantum ...
Room-temperature ingredients are more easily incorporated with one another. And all of these dairy items have proteins that will do the best job of locking in minuscule air bubbles if they are at ...
Helium II: ≳100000 [88] ... The recommended values are thought to be accurate to within 3% near room temperature and 3 to [unintelligible] at other temperatures ...