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!

High pressure tungsten incandescent light bulbs?

  1. Apr 15, 2014 #1
    With increased pressure tungsten has a higher melting point. (source below page 30) 45kBar increases melting point from 3422oC to 3700oC.

    http://www.nist.gov/data/PDFfiles/jpcrd55.pdf [Broken]

    An ideal 5800 K black-body, truncated would be 37% efficient.


    So extrapolating this graph a 300kBar light bulb would be at 5800k and 37% efficient. I know this an extremely high pressure but would this theoretically work?
    Last edited by a moderator: May 6, 2017
  2. jcsd
  3. Apr 15, 2014 #2

    Vanadium 50

    User Avatar
    Staff Emeritus
    Science Advisor
    Education Advisor
    2017 Award

    No, because you'd have to make the bulb out of steel, not glass. A steel light bulb won't work very well.
  4. Apr 15, 2014 #3
    Pressure works out to be around 3000kg/mm2. I'm not sure if it's even possible to hold that in...Also I'm not sure if the gas inside would turn to liquid in which case it would certainly conduct the heat much more effectively, which would transfer to the case.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook