I want to know the answer to the following question:
How do gases prevent evaporation of the filament?
All the background I'm provided with is that "The presence of gas molecules knocks the liberated tungsten atoms back to the filament, reducing its evaporation and allowing it to be operated at higher temperature without reducing its life (or, for operating at the same temperature, prolongs the filament life).". Is that enough to answer the question?
Answer: yes