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How is the vacuum in a light bulb sealed?

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  1. Dec 17, 2015 #1
    I understand that one would use a vacuum pump to evacuate a light bulb, but once a vacuum is created, how is the bulb sealed without air coming in?
     
  2. jcsd
  3. Dec 17, 2015 #2

    DaveC426913

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    Gold Member

    The evacuation and the sealing of the bulb's end (by heating in a press) are part of the same step.

    How it's Made:
     
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