Question

Air is completely removed from an electric bulb to prevent what ?

Answer 1

Answer:

The reason a light bulb has no 'air' in it is because the oxygen in the air would chase the filament to burn as fire needs oxygen to burn.

Explanation:

Bulb is not filled with air doesn't mean that it’s vacuum inside bulb. Actually we mean we remove atmospheric air which has oxygen by filling with NITROGEN or ARGON gas.

NITROGEN and ARGON are both inert gases so its presence around filament won't result in easy burnout (oxidation or evaporation) of filament even when filament reaches very high temperature..

Also the pressure exerted by these gases onto the filament further adds to the strength of filament.

Answer 2

Answer:

To prevent oxidation of the filament in the bulb.

Explanation:

• Air is removed from the electric bulb in order to avoid the O₂ in the air from reacting with the filament, causing it to wear out by burning. thereby, the bulb becoming less efficient.
• However, this doesn't mean that the insides of a bulb are filled with vacuum. In reality, the air is removed and is replaced with pure N₂ or Ar gas.
• Nitrogen and Argon gases are inert, thereby causing no reaction, even at high temperatures.
• Additionally, these gases exert pressure on the filament in the bulb, which is known to provide the filament with more strength.
  

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