What was the initial name Joseph Montgolfier gave to the substance he hypothesized caused buoyancy?

Answer

gas montgolfier

Joseph initially believed a specific component in the smoke caused the lift and called this mysterious lifting agent *gas montgolfier* before realizing the key was the heated air itself.

What was the initial name Joseph Montgolfier gave to the substance he hypothesized caused buoyancy?
inventionaviationflightballoonMontgolfier brother