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Let me add that the demo is more demonstrative if there are two tethered objects in each closed, glass container. One object is "heavier than water" and wants to sink - it is tethered to the top of the container. The second is "lighter than water" and wants to float - it is tethered to the bottom of the container. The tethers are short enough so that the two objects do not interfere with each other. When the container is accelerated in a given ...