Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 69,872   Posts: 1,520,117   Online: 870
      
Page 2 of 2 FirstFirst 12
Results 11 to 17 of 17
  1. #11

    Join Date
    Sep 2004
    Location
    Toronto, Canada
    Shooter
    Multi Format
    Posts
    587
    Joe,

    I think Gerald answered your question well. W/v solutions are much easier to work with than w/w (although sometimes things like concentrated acids are specified in w/w). I always assume that photographic solutions are w/v unless specified otherwise.

  2. #12

    Join Date
    Jun 2004
    Location
    Portland, OR
    Shooter
    4x5 Format
    Posts
    3,268
    Quote Originally Posted by smieglitz
    Where's that avacado guy when you need him?
    I think he's somewhere in California, maybe Mexico...

  3. #13
    smieglitz's Avatar
    Join Date
    Oct 2002
    Location
    Kalamazoo, Michigan, USA
    Shooter
    Large Format
    Posts
    1,863
    Images
    97
    Quote Originally Posted by Gerald Koch
    ...Hope that these 3 examples make things clearer.
    Yes they do. Thanks Gerald.

  4. #14

    Join Date
    Jun 2004
    Location
    Portland, OR
    Shooter
    4x5 Format
    Posts
    3,268
    Quote Originally Posted by smieglitz
    Now you two have me confused. What is the clue as to whether a recipe is calling for a w/w or w/v measurement?
    I once suggested that people try to include the appropriate designation when discussing percent solutions, but I was accused of being too nit-picky. Perhaps, but it would remove some of the ambiguity.

    There are actually 4 types of percent solutions:

    w/w = weight per weight
    w/v = weight per volume
    v/w = volume per weight
    v/v = volume per volume

  5. #15

    Join Date
    Mar 2003
    Location
    Greenville, SC
    Shooter
    Large Format
    Posts
    4,813
    Images
    5
    Quote Originally Posted by Kirk Keyes
    I once suggested that people try to include the appropriate designation when discussing percent solutions, but I was accused of being too nit-picky. Perhaps, but it would remove some of the ambiguity.

    There are actually 4 types of percent solutions:

    w/w = weight per weight
    w/v = weight per volume
    v/w = volume per weight
    v/v = volume per volume
    Well, there are worse things to be called than nit-picky.

    As others have noted, in photography percent solutions are nearly always made in w/v and unless there exists some contrary reason I see no point in designating otherwise.

    Of course, the concept of percent solution w/v is not all that well understood, but Gerald Koch's explanation was concise and clear. Before Gerald's explanation we saw already how loose was the designation w/v.

    Sandy

  6. #16

    Join Date
    Jun 2004
    Location
    Portland, OR
    Shooter
    4x5 Format
    Posts
    3,268
    Quote Originally Posted by sanking
    Well, there are worse things to be called than nit-picky.
    Actually, I have been called worse than that here. I was trying to be nice about it.

  7. #17

    Join Date
    Apr 2006
    Location
    Toronto, CANADA
    Shooter
    Multi Format
    Posts
    33
    Thanks a lot everyone

Page 2 of 2 FirstFirst 12


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



Contact Us  |  Support Us!  |  Advertise  |  Site Terms  |  Archive  —   Search  |  Mobile Device Access  |  RSS  |  Facebook  |  Linkedin