Is there no gas inside an electric bulb?

No, that’s not true. An electric bulb is not empty. If it were just a vacuum, the thin tungsten filament would burn out very quickly when heated. That’s why manufacturers fill the bulb with inert gases like argon (and sometimes nitrogen).

These gases slow down the evaporation of the filament, prevent it from breaking too soon, and help the bulb shine for a longer time.

Yes, there is gas inside an electric bulb mainly argon to protect the filament and increase its life