Hydrogen – Melting Point and Boiling Point
Melting point of Hydrogen is -259.1°C.
Boiling point of Hydrogen is -252.9°C.
Note that, these points are associated with the standard atmospheric pressure.
Boiling Point – Saturation
In thermodynamics, the term saturation defines a condition in which a mixture of vapor and liquid can exist together at a given temperature and pressure. The temperature at which vaporization (boiling) starts to occur for a given pressure is called the saturation temperature or boiling point. The pressure at which vaporization (boiling) starts to occur for a given temperature is called the saturation pressure. When considered as the temperature of the reverse change from vapor to liquid, it is referred to as the condensation point.
Melting Point – Saturation
In thermodynamics, the melting point defines a condition in which the solid and liquid can exist in equilibrium. Adding a heat will convert the solid into a liquid with no temperature change. The melting point of a substance depends on pressure and is usually specified at standard pressure. When considered as the temperature of the reverse change from liquid to solid, it is referred to as the freezing point or crystallization point.
Hydrogen – Properties
|Element Category||Non Metal|
|Phase at STP||Gas|
|Atomic Mass [amu]||1.0079|
|Density at STP [g/cm3]||0.0899|
|Possible Oxidation States||+1,-1|
|Electron Affinity [kJ/mol]||72.8|
|Electronegativity [Pauling scale]||2.2|
|1st Ionization Energy [eV]||13.5984|
|Year of Discovery||1766|
|Melting Point [Celsius scale]||-259.1|
|Boiling Point [Celsius scale]||-252.9|
|Thermal Conductivity [W/m K]||0.1805|
|Specific Heat [J/g K]||14.304|
|Heat of Fusion [kJ/mol]||0.05868|
|Heat of Vaporization [kJ/mol]||0.44936|