'gaseous' originates from the Latin word 'gas,' which was coined by the Flemish chemist Jan Baptist van Helmont in the 17th century.

'gas' was derived from the Greek word 'chaos,' and eventually became the modern English word 'gas' and its adjective form 'gaseous.'

Initially, it referred to any form of air or vapor, but over time it evolved into its current meaning of 'in the form of gas.'