Tags: Chemical Compound, Chemical Substance.
Hydrogen bromide is the diatomic molecule HBr. HBr is a gas at standard conditions. Hydrobromic acid forms upon dissolving HBr in water. Conversely HBr can be liberated from hydrobromic acid solutions with the addition of a dehydration agent but not by distillation. Hydrogen bromide and hydrobromic acid are therefore not the same but they are related.
