james___ Posted July 22, 2001 Share Posted July 22, 2001 "A relationship between the amounts or sizes of two things, expressed as a quotient: proportion." It is not 1 "in" 3 but 1 "to" 3. One part stock solution "to" three parts water. Pretty clear. James Link to comment Share on other sites More sharing options...
mpumi_magagula Posted November 29, 2007 Share Posted November 29, 2007 I have been always using 1:3 ratio to simply represent dilute 1 part in 3 parts water to give a final volume of 4X dilution factor. Link to comment Share on other sites More sharing options...
dave_s Posted November 29, 2007 Share Posted November 29, 2007 Martin Tai and Ed Buffaloe are correct: the convention used by photographers differs from real-world laboratory practice. If you want to be clear, state it as a percentage, like "50% Xtol" or "HC-110 3%". Link to comment Share on other sites More sharing options...
photojim Posted November 29, 2007 Share Posted November 29, 2007 Actually, to be pedantic, ":" doesn't mean "ratio"; "/" does. i.e., 1/3 means one part in 3. Mathematics does not use the colon to denote ratios; it uses the slash. Ratios are division. Link to comment Share on other sites More sharing options...
stwrtertbsratbs5 Posted November 29, 2007 Share Posted November 29, 2007 This is why chemists use molarity - then there is no ambiguity. Link to comment Share on other sites More sharing options...
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