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Expansion coefficient of liquid Propane ?

by bitman
Tags: coefficient, expansion, liquid, propane
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bitman
#1
Jul29-08, 05:32 AM
P: 18
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
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mgb_phys
#2
Jul29-08, 08:55 AM
Sci Advisor
HW Helper
P: 8,953
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
uart
#3
Jul29-08, 10:16 AM
Sci Advisor
P: 2,751
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

bitman
#4
Jul29-08, 10:54 AM
P: 18
Expansion coefficient of liquid Propane ?

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
mgb_phys
#5
Jul29-08, 11:06 AM
Sci Advisor
HW Helper
P: 8,953
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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