Abstract
It is known that the water does not flow out of an open bottle with a hole, if the bottle moves freely in a gravitational field (downward, upward, sideward). This article presents how to make and use a ‘modified’ bottle with an elastic bottom that is able to launch a water jet from a free-falling bottle. This behaviour of water is a new classroom demonstration of free-fall weightlessness. In addition, asking students to design that or different ‘modified’ water-launching bottle might be for them both a transfer-of-learning question and creative experimental challenge.
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