Expansion coefficient of liquid Propane ?

  1. Hi

    Does anyone have a figure for this.

    I've trolled the net for nearly 2 hours now with no success.

    Any help or guidance much appreciated.

    Bitman
     
  2. jcsd
  3. mgb_phys

    mgb_phys 8,952
    Science Advisor
    Homework Helper

    CRC handbook lists the density at various temperatures fordifferent pressures:
    At 1 atmosphere (gas)
    T (k) density(mol/L)
    250 0.050
    275 0.045
    300 0.041
    325 0.037
    350 0.035
    375 0.032
    400 0.030
    450 0.027
    500 0.024

    At 10 atmospheres (liquid)
    T (k) density(mol/L)
    275 11.962
    300 11.102
     
  4. uart

    uart 2,776
    Science Advisor

    Also note that at 1 atmos and tempertures > 0C that mgb's figures agree with the ideal gas law with at most 2% error. So if you are working in this range then you don't need to look it up, you can calculate it.

    PV = NRT

    with N and P held constant.

    dV/V = dT/T

    or dV/dT = V/T
     
  5. Hi

    I'm really interested in the liquid properties. I can do the gas stuff (mostly, when I get the sums right :-0 ).

    I'm interested in the change of density between 353k (448.9psi) and 293k(124.6 psi).

    I thought as it was a liquid it was incompressable thus the pressure didn't matter. If so it should have a fixed coefficient of expansion.

    Your figures, mgb_phys, at 10 atm seem to indicate -0.288% per degree C.

    So assuming the pressure change is inconsequential I'm looking at a reduction in liquid density of 17.28%.

    Thanks for the info and the time.

    Please protest if you think these conclusions are incorrect.

    Bitman
     
  6. mgb_phys

    mgb_phys 8,952
    Science Advisor
    Homework Helper

    The handbook only gives 1Mpa and 10Mpa - you can interpolate the values you need.
    1Mpa
    275 = 11.962
    300 = 11.102
    325 - gas

    10Mpa
    325 = 10.860
    350 = 9.973
    375 = 8.905

    293K/124.6psi looks very close to boiling point
     
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