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Thermal equation of state and critical point

Thermal equation of state and critical point

Item no.: P2320400

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A substance which is gaseous under normal conditions is enclosed in a variable volume and the variation of pressure with the volume is recorded at different temperatures. The critical point is determined graphically from a plot of the isotherms.


  • Visualization of the critical point


  1. Measure a number of p-V isotherms of ethane.
  2. Determine the critical point and the critical quantities of ethane.
  3. Calculate the constants of the Van der Waals equation, the Boyle temperature, the radius of the molecules and the parameters of the interaction potential.

What you can learn about

  • Ideal gases
  • Real gases
  • Equations of state
  • Van der Waals equation
  • Boyle temperature
  • Critical point
  • Interaction potential
  • Molecule radius
Document     Filesize
p2320400e.pdf Experiment guide, English 348.8 KB

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