Free Fall Tube, 1 Each

The Free Fall Tube by United Scientific is a feather-and-disc demonstration showing that all objects fall with the same gravitational acceleration in a vacuum, while air resistance slows some objects in air. A disc and feather sit in a tough, clear plastic tube 90 cm long and 4.5 cm in diameter, with rubber end caps and a hose cock for any standard vacuum pump (not included). Includes an activity guide.