A Ball and a Feather
November 4, 2014 • 10:07

I guess everybody has heard of the experiment with the bowling ball and feather falling at the same speed, if the surrounding is a vacuum. It is an easy example to illustrate the air drag on objects and the resulting behaviour in our regular environment. But when the air is missing there is only one force at work, which is gravity with a constant acceleration of 9.81 m/s².

The BBC went to the world’s largest thermal vacuum chamber operated by NASA. They conducted the experiment from a serious height and the result is absolutely astonishing. It is unbelievable how motionless these two objects are resting in the air vacuum while falling.