Tap to measure the position of the molecule.

            Wrong side:        wait a little longer.

Randomise the molecule’s position

Tap to measure the position of the molecule.

The molecule is  on the left side: slide the piston inside  without resistance from  the molecule.

swipe left

Let the molecule push the piston.

Net result:work done on the piston.

Let the molecule push the piston out.

Return to the initial state

Paradox! We produce useful work by extracting heat from the molecule. This violates the Second Law of thermodynamics!