Demos by PIRA

  4D30.10Mechanical model of a gas: Vibrating balls strike piston on OHP.
  4D30.10Mechanical model of a gas: Vibrating balls strike piston on OHP.
  4D30.20Mechanical model of a gas: Vibrating balls strike piston on OHP.
  4D30.20Mechanical model of a gas: Vibrating balls on OHP.
  4D30.40Stoekle's apparatus: Heated tube with mercury and glass bits.