1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Why doesn't a fluorescent lamp implode and shatter ?

  1. Feb 2, 2016 #1
    Accoring to Wikipedia, the pressure inside a fluorescent lamp is 0.3% of the atmospheric pressure, so the pressure difference between the outside and the inside of the lamp is almost equal to the atmospheric pressure which is 1 bar or 14.7 psi.

    Now according to this and this, glass shatters at an overpressure of about 1 psi, and sometimes even less than that.

    So why doesn't the difference in pressure between the outside and the inside of a fluorescent lamp cause the glass to shatter ?
     
  2. jcsd
  3. Feb 2, 2016 #2

    russ_watters

    User Avatar

    Staff: Mentor

    The article is referring to windows, which are flat. Arches (tubes)are much stronger.
     
  4. Feb 2, 2016 #3
    So if the lamp shape was rectangular for example, would it shatter ?
     
  5. Feb 2, 2016 #4

    sophiecentaur

    User Avatar
    Science Advisor
    Gold Member

    Yes; unless the glass was very thick. The principle of using curved surfaces for vacuum vessels is pretty universal. CRTs, radio valves, dewar flasks . . . . .
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Why doesn't a fluorescent lamp implode and shatter ?
  1. Fluorescent lamps (Replies: 3)

Loading...