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Liquid hydrogen (H 2 (l)) is the liquid state of the element hydrogen.Hydrogen is found naturally in the molecular H 2 form. [4]To exist as a liquid, H 2 must be cooled below its critical point of 33 K.
Boiling point (°C) K b (°C⋅kg/mol) Freezing point (°C) K f (°C⋅kg/mol) Data source; Aniline: 184.3 3.69 –5.96 –5.87 K b & K f [1] Lauric acid: 298.9 44 ...
Liquid hydrogen is a common rocket propellant, and it can also be used as the fuel for an internal combustion engine or fuel cell. [citation needed] Solid hydrogen can be made at standard pressure, by decreasing the temperature below hydrogen's melting point of 14.01 K (−259.14 °C; −434.45 °F).
freezing point 1357.77 K (1084.62 °C) fixed point on ITS-90: 30 Zn zinc; use: 692.68 K: 419.53 °C: 787.15 °F WEL: 692.68 K: 419.53 °C: 787.15 °F CRC: 419.53 °C: LNG: 419.527 °C: freezing point 692.677 K (419.527 °C) fixed point on ITS-90: 31 Ga gallium; use: 302.9146 K: 29.7646 °C: 85.5763 °F WEL: 302.91 K: 29.76 °C: 85.57 °F CRC ...
Solid hydrogen is the solid state of the element hydrogen. At standard pressure , this is achieved by decreasing the temperature below hydrogen's melting point of 14.01 K (−259.14 °C; −434.45 °F).
If a gap exists between the solidus and liquidus it is called the freezing range, and within that gap, the substance consists of a mixture of solid and liquid phases (like a slurry). Such is the case, for example, with the olivine ( forsterite - fayalite ) system, which is common in Earth's mantle .
Supercooling is the cooling of a liquid below its freezing point without it becoming solid. Freezing point depression is when a solution can be cooled below the freezing point of the corresponding pure liquid due to the presence of the solute; an example of this is the freezing point depression that occurs when salt is added to pure water.
Thus, a liquid cannot exist permanently if the evaporated liquid is continually removed. [39] A liquid at or above its boiling point will normally boil, though superheating can prevent this in certain circumstances. At a temperature below the freezing point, a liquid will tend to crystallize, changing to its solid form.