Benefits

• Visualization of the critical point

Bath for thermostat, makrolon

External circulation set for thermostat Alpha A

Immersion thermostat Alpha A, 230 V

Secure bottle, 500 ml, 2 x Gl 18/8, 1 x 25/12

Spring manometer, 0…-1000 mbar

Glass tube, right-angled

Glass tubes, right-angled, 10

Stopcock,3-way,t-shaped, glass

Right angle boss-head clamp

Universal clamp

Lab thermometer,-10..+110 °C

Rubber tubing, i.d. 8 mm

Rubber tubing,vacuum,i.d.6mm

Rubber tubing,vacuum,i.d.8mm

Rubber tubing, i.d. 10 mm

Hose clip f.12-20 diameter tube

Hose clip, diam. 8-16 mm, 1 pc.

Hose clamp for 5-12 mm diameter

Gasket for GL18, 8mm hole, 10 pcs

Compressed gas, sulphur hexafluoride

Pinchcock, width 15 mm

Tubing connector, ID 6-10mm

Tripod base PHYWE

Support rod, stainless steel, 500 mm

Mercury tray

Adapter for vacuum pump

Rotary valve vacuum pump, two stages, 115 V / 230 V

Critical point apparatus

Tasks

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