By pressing on the bottle, it is transmitted to all points of the fluid (Pascal principle) and compresses the bag of ketchup (it has some air in it), and that's the thrust is less (because the volume occupied by the stock market is lower) and the stock drops in the bottle ketchup. When we press, the stock recovers the original volume and the push (that under the principle of Archimedes equals the weight of the fluid evacuated) increases.
works well if we use a large bottle (2 liters) of soft plastic.
can also experience Ludion used as a test tube spent to keep a small pocket of air inside.
The Ludion was an "invention" of Descartes. The name "Ludion" is that its purpose was essentially playful. In a bottle filled with water, dipped a little devil was moving as pressure or not the bottle.
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