Van der Waals.py

From Werner KRAUTH

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This is the python2 program useful for the homework session of week 04 of my ICFP Lectures on statistical mechanics. 


import pylab, numpy
for t in numpy.arange(0.3, 1.5, 0.1):
    vval = []
    pval = []
    for v in numpy.arange(0.34, 4.0, 0.001):
        p = 8.0 * t / 3.0 / (v - 0.333333) - 3.0 / v ** 2
        vval.append(v)
        pval.append(p)
    pylab.plot(vval, pval, label='$T=$'+ str(t))
pylab.title("van der Waals equation of state")
pylab.xlabel("reduced volume $v$")
pylab.ylabel("reduced pressure $p$")
pylab.xlim([0.0,3.5])
pylab.ylim([-2.0,4.0])
pylab.legend(loc='upper right')
pylab.savefig('Eq_state_vdw.png')
pylab.show()
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