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Problem of compression

  1. Sep 26, 2016 #1

    grandpa2390

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    Gold Member

    1. The problem statement, all variables and given/known data
    I am doing a problem of compression work. in order to solve it, I have to find an equation for the line and integrate it to get the work. But I don't understand why ##k = \frac{P_i}{V_i}##

    2. Relevant equations

    P=kV

    3. The attempt at a solution

    Why is it Pi / Vi and not Pf / Vf ? They both give different answers. In original units of atmospheres and liters they both give the same number (1). IT is when you convert to meters cubed and N/meters cubed that the value of k is different. it is not far off, but slightly.

    Is it just a margin of error, but in general either one works. Or is using the initial values a matter of importance.
     
  2. jcsd
  3. Sep 26, 2016 #2

    Nidum

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    Science Advisor
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    There are different ways of calculating compression work depending on what happens to the heat generated by the compression process .

    There are sometimes practical things to take into account as well such as effect of dead volume .

    Can you tell us more exactly what problem you are working on ?
     
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