Question

When an ideal gas undergoes unrestrained expansion, no cooling occurs because the molecules

• A. Are above the inversion temperature
• B. Exert no attractive force on each other
• C. Do work equal to loss in kinetic energy
• D. Collide without loss of energy

Answer 1

The correct option is B Exert no attractive force on each other

In case of free expansion of an ideal gas, cooling or heating does not happen because no attractive forces exist between the molecules.

In case of free expansion of real gas, its temperature may increase or decrease depending on the initial temperature and pressure.