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Bottle Flipping Clarification 3

posted Oct 18, 2017, 4:35 AM by Michael Maloney   [ updated Oct 18, 2017, 4:36 AM ]
Question: Does the phase of the water matter?  Does it have to be liquid?

Answer: The event description says "You may not use substances other than water and air inside the bottle."  A pedantic interpretation would suggest that the word "water" generally refers only to liquid water, and the terms "ice" and "steam" or "water vapor" are used for the liquid and gaseous forms, respectively.  However, NSSL tradition is to allow as broad an interpretation as is reasonable, in order to foster creativity.  My intent was to create an event that would allow for a wide variety of solutions to maximize the opportunities for creativity.  So...

The water does not have to be liquid.  However, note that the glass transition temperature of amorphous PET plastic is 67°C.  At temperatures above the glass transition temperature, the integrity of the bottle is likely to fail.  So you may use ice, but for safety reasons, you may not use steam.