Joule-Thomson Effect

• Nitrogen Steel cylinder with pressure gauge.
• Serpentine for temperature neutralization
• CO2 Steel Cylinder with pressure gauge.
• Porous element in cavity
• two Pt100 immersion temperature probes
• two digital meters
• Gas reducing valves.
• Rubber connection.
• Connection cables.
• Acrylic holder.


• In this experiment, we determine the Joule-Thomson coefficient that is defined as a change in temperature of a thermally insulated gas when it is forced through a small hole or a porous material. For each gas there is a temperature of inversion above which the change is positive and below which it is negative.
• To measured it by allowing gas with P1 and T1 to pass through porous element to become P2 and T2