Is Plasma Possible Inside a Light Bulb?

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Discussion Overview

The discussion revolves around the possibility of creating plasma inside a light bulb, particularly in the context of traditional incandescent bulbs, which are typically filled with inert gases rather than being a complete vacuum.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant questions whether plasma can exist inside a light bulb, noting that the interior is generally understood to be a vacuum.
  • Another participant clarifies that incandescent bulbs are not actually a vacuum but are filled with inert gases at about 70% atmospheric pressure, which could allow for different phenomena.
  • A participant expresses surprise at the idea of plasma in a light bulb and shares a link to a plasma globe project, suggesting a connection between the two concepts.
  • Another contribution discusses the potential for experimentation with light bulbs, indicating that a working filament can act as an anode or diode depending on the conditions, and that bulbs can be repurposed for such experiments.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the feasibility of plasma in light bulbs, with some exploring the idea while others provide clarifications about the conditions inside the bulbs. Multiple viewpoints and possibilities remain open for discussion.

Contextual Notes

The discussion does not resolve the assumptions about the conditions necessary for plasma to form in light bulbs, nor does it clarify the implications of using inert gases versus a vacuum.

iScience
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http://i.imgur.com/bLUjP0Q.jpg

is something like this even possible in a light bulb? i thought the interior was supposed to be a vacuum.
 
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iScience said:
i thought the interior was supposed to be a vacuum.
The thin glass used in a typical incandescent light bulb is not near strong enough to sustain a vacuum. Incandescent bulbs are filled with inert gases to about 70% atmospheric pressure.
 
The lights at the back of a car include a combined rear light / brake light bulb.

Usually this is replaced when one of the lamp filaments burns out.

This gives you a chance to experiment since you now have a working filament and a disconnected wire which will work as an anode if the filament is supplied with its normal voltage. It will work as a diode if the bulb is under vacuum or as a plasma display if it contains gas.

Local repair shops usually discard such bulbs but would probably save you a few if you ask.
 

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