Technical data

Thermal equation of state and critical point

Article no: P2320410

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Principle

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.

Benefits

Visualization of the critical point

Tasks

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

Learning objectives

Ideal gases
Real gases
Equations of state
Van der Waals equation
Boyle temperature
Critical point
Interaction potential
Molecule radius

Scope of delivery

Critical point apparatus	04365-00	1
Immersion thermostat Alpha A, up to 100 °C, 230 V	08493-93	1
Bath for thermostat, makrolon	08487-02	1
External circulation set for thermostat Alpha A	08493-02	1
Compressed gas, sulphur hexafluoride	41772-21	1
Digital thermometer, -50...+1300°C, for type K and J sensor	07022-00	1
Immersion probe NiCr-Ni, steel, -50...400 °C	13615-03	1
Tubing connector, ID 6-10mm	47516-01	4
Hose clip, diam. 8-16 mm, 1 pc.	40996-02	4
Hose clamp for 8-12 mm diameter	41000-00	4
Silicone tubing, various diameters	47532-00	2
Silicone tubing, various diameters	39296-00	1