Hydrogen bromide

Hydrogen bromide, HBr, is a poisonous, colourless gas with a pungent smell. It is used in the chemical industry as intermediate for pharmaceutical products. 

Properties

Molecular weight 80.912 g/mol

Gaseous phase Gas density (1.013 bar at boiling point): 4.88 kg/m³
 Gas density (1.013 bar and 15 °C (59 °F)): 3.44 kg/m³

Liquid phase Boiling point: (1.013 bar): -66.72 °C
 Liquid density (1.013 bar at boiling point): 2205 kg/m³

Critical point Critical temperature: 90 °C
 Critical pressure 85.52 bar