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#6 Constant eV wrong

1.x
closed-fixed
nobody
Math (8)
5
2005-06-10
2005-06-10
Jens-Erik
No

The constant electron volt eV has the same number
(thoug a different unit) like the electron charge e in
SI units:

e = 1,60218E-19 C | * V
=> 1 eV = 1,60218E-19 C V = 1,60218E-19 J
(1 V = 1J/C, 1 C = 1 As)

But in Wcalc 1.7 1 eV = 1,60218E-12.

Jens

Discussion

  • Kyle Wheeler

    Kyle Wheeler - 2005-06-10

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    Hmm, it seems I put it in with ergs as the units. 1 eV = 1,60218E-19
    Joules = 1,60218E-12 ergs. Is Joule more standard?

     
  • Kyle Wheeler

    Kyle Wheeler - 2005-06-10
    • status: open --> pending
     
  • Jens-Erik

    Jens-Erik - 2005-06-10
    • status: pending --> open
     
  • Jens-Erik

    Jens-Erik - 2005-06-10

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    ergs is the cgs unit. cgs is also common, especially amoung
    scientist, especially theoretical physicists like it better
    than SI.

    But either everything should be in SI or everything in cgs.
    Speed of light (2,997925E+08 m/s) and gravity acceleration
    (9,806650E+00 m/s^2) are in SI, probably all the rest, too
    (I haven't checked everything). Using an incoherent unit is
    especially dangerous because you don't see the unit.

    It would also be possible to add an option for SI or cgs in
    the preferences, but plesae don't mix SI and cgs! Personally
    I'm not much into cgs and you wouldn't expect cgs units
    unless explicitly noted.

    Anyway, thanks for the nice program!

    Jens

     
  • Jens-Erik

    Jens-Erik - 2005-06-10

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    I wanted to write "among scientists", of course, I couldn't
    correct my typos.

     
  • Kyle Wheeler

    Kyle Wheeler - 2005-06-10

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    user_id=17596

    Units set to Joules. Will look into SI vs cgs for future features. It'll be fixed
    in the next revision. Glad you like it!

     
  • Kyle Wheeler

    Kyle Wheeler - 2005-06-10
    • status: open --> closed-fixed
     

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