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The jar, much like massive ships on the ocean, displaces the water and thus it floats. The jar doesn't even need to be sealed--but it does have to remain upright so it doesn't tip over and fill with water.

You can imagine the water that is being displaced pushing upward toward the jar to to keep it afloat despite the jar's weight.

Another factor that may be playing a part in this is that in a sealed jar, much like an inner tube at the pool, the air inside is less dense than water. The general rule of physics, in this case, is that less dense objects are "lighter" than those of more dense objects--the relative densities of the two things (water and the jar filled with air) would determine which object rises to the top.

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13y ago

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