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The rate of evaporation of tungsten filament in a lamp depends on

  • The rate of evaporation of tungsten filament in a lamp depends on Vapor pressure inside.
  • As the filament heats up, tungsten atoms evaporate from the surface and deposit on the cooler parts of the lamp, causing the filament to slowly degrade over time.
  • The pressure of the gas inside the lamp can affect the rate of evaporation by altering the temperature at which the tungsten atoms evaporate from the filament.
  • A higher-pressure gas can increase the rate of evaporation by allowing the filament to operate at a higher temperature before the tungsten begins to evaporate.
  • However, the pressure of the gas inside the lamp is usually maintained at a low level to reduce energy losses due to collisions between gas molecules and the filament.