Joule-Thomson effect

Principle

A stream of gas is fed to a throttling point, where the gas (CO₂ or N₂) undergoes adiabatic expansion. The differences in temperature established between the two sides of the throttle point are measured at various pressures and the Joule-Thomson coefficients of the gases in question are calculated.

Benefits

• For both demonstration and student experiments
• With detailed experiment guide
• Affordable set-up

Tasks

1. Determination of the Joule-Thomson coefficient of CO₂.
2. Determination of the Joule-Thomson coefficient of N₂.

Learning objectives

• Real gas
• Intrinsic energy
• Gay-Lussac theory
• Throttling
• Van der Waals equation
• Van der Waals force
• Inverse Joule-Thomson effect
• Inversion temperature