Properties of Barium (Ba)

Barium is a chemical element with the symbol (Ba) and atomic number 56. It belongs to the alkaline earth metal group on the periodic table. Barium is a soft, silvery-white metal that is highly reactive with air and water, and it forms various compounds. In nature, it is often found in the mineral barite.

The following table provides a comprehensive list of barium (Ba) properties in both SI and US customary/Imperial units at normal temperature and pressure (NTP).

Click on the icon to switch between Metric and Imperial units.

Table of Barium Properties
Physical Properties
Metric
Crystal StructureBody-centered cubic (bcc)
Atomic Number56
Molar Mass137.327 g/mol
Density3590 kg/m3
Mechanical PropertiesMetric
Young’s Modulus (E)12.8 GPa
Shear Modulus (G)4.86 GPa
Bulk Modulus (K)10.3 GPa
Poisson’s Ratio (ν)0.28
Mohs Hardness1.25
Thermal PropertiesMetric
Melting Point727 °C
Boiling Point1845 °C
Thermal Conductivity (27°C)18.4 W/m·K
Specific Heat Capacity (Cp) (25°C)205 J/kg·K
Coefficient of Thermal Expansion (αL) (25°C)2.06×10-5 1/°C
Electrical PropertiesMetric
Electrical Resistivity3.32×10-5 Ω·cm

Unless stated otherwise, all values are taken at room temperature (approximately 20°C or 68°F) and 1 atm pressure. (1 atm = 101,325 Pa)

References: 1) Cardarelli, François. Materials Handbook: A Concise Desktop Reference. Switzerland: Springer International Publishing, 2018. 2) CRC Handbook of Chemistry and Physics, 97th Edition. United Kingdom: CRC Press, 2016-2017. 3) A.M. Howatson, P.G. Lun, J.D. Todd, P.D. Engineering Tables and Data. United Kingdom: University of Oxford, Department of Engineering Science, 2009.