Half a croissant, on a plate, with a sign in front of it saying '50c'
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Solid Fuel Lighter H

Use frozen hydrogen
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Letters are well-known as designators. Consider Henry Ford and the Model T, for example.

This lighter will have a plastic double-wall "Dewar flask" case, and the fuel is solid hydrogen. Its shape is cylindrical, skinny, and short. A supercapacitor and some other electronics provides a spark at the push of a button. Said button-push also mechanically extrudes the solid hydrogen, to be ignited. The fuel container needs to be refilled, and the supercapacitor needs to be recharged, after each use. But definitely weighs rather less than most other lighters, partly because the vacuum in-between the plastic walls weighs nothing, partly because solid hydrogen is one of the lightest substances around, and partly because the overall device is smallish.

Vernon, Sep 30 2015

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       As delightfully complicated as this thing is, I hate to quibble. But ...   

       Hydrogen flame is near invisible. Anybody using this is going to be wondering if it is working, and won't be sure where the flame is. Maybe some glowing metal guides?   

       Also, the title kind of precludes charcoal lighters, and Sterno lighters. Can you put an "H" in the title?
baconbrain, Oct 05 2015
  
      
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