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Why is the active mass of solids taken as unity?

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  1. Dec 28, 2015 #1
    1. The problem statement, all variables and given/known data
    I understood the fact that since the density of solids and liquids remain constant in a reaction therefore the active mass must be a constant.But why is it that we take it as unity. Is is some kind of coonverntion,or is there a reason behind it?

    2. Relevant equations


    3. The attempt at a solution
     
  2. jcsd
  3. Dec 28, 2015 #2

    Borek

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    Staff: Mentor

    Convention, with a good reason behind - 1 is a nice number that makes calculations easy.
     
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