|An economical version of a classic device! It demonstrates that
all objects experience the same gravitational acceleration and
fall at the same speed in a vacuum, but in air the air resistance
slows down some objects more than others. Features a disc and a
feather in a tough, clear, plastic tube, 90cm long and 4.5cm
diameter, with rubber end caps and hose cock for connection to any
standard vacuum pump (not included.)
Dimensions: 40" x 3" x 3".
Includes an activity guide.