One of the simplest experiments with liquid, often used by magicians in performances, is an inverted glass of water that does not pour out of it. You can do this experience yourself.
It is necessary
Scissors, cardboard (thin) or thick paper, ruler, 1 glass, 1 marker, glass or plastic bowl, water in a jug
Instructions
Step 1
You need to prepare for this experiment (or trick). To do this, cut a square from a sheet of cardboard with scissors. It should be larger than the diameter of the glass and protrude 3 cm beyond its edges along the edges. Write with a marker on the cut out sheet of cardboard the inscription "Do not shake!" This must be remembered by you and your viewers. Put a glass or plastic container on the table, an empty glass, water in a jug, put prepared cardboard.
Step 2
Pour water into a glass, you can to the very edge. Take the cardboard in your hand with the lettering facing up and place it on the edges of the glass. The hand must certainly be clean, not sticky, so that the cardboard does not stick to it at the most crucial moment. Turn the glass over in a quick motion, holding the cardboard in the palm of your hand. Do this over a bowl. Place the cardboard carefully on the bowl, and remove your hand carefully. You and your audience will see that not a drop of water has spilled, and it continues to be in the glass.
Step 3
The same experiment can be performed with different amounts of water in a glass, different materials that hold water in it, for example, with a regular album sheet. You can also skip the cardboard, but simply take your hand away from the sheet while holding the glass on top with your other hand. The result will always be the same and no water will spill out of the glass.
Step 4
There is such a scientific explanation for this experiment based on the physical properties of substances: water does not spill outside the cardboard, because air pressure is created between it and the cardboard, which acts on the paper. Also, the scientific fact plays a role that molecules on the surface of any liquid bind together and create a film invisible to the eye. In this case, a film forms on the surface of the water when it is adjacent to the paper. In fact, in this case, water practically "sticks" to a sheet of cardboard.
