Drinking glass. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Drinking glass. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

Of course, the sound of a glass cannot be compared with the sound of combs. You just need to choose a good "tool" for this experience. Our “tool” will be a glass (not crystal) thin-walled glass on a stem, with a capacity of from half to a glass of liquid. The glass of the glass should be clean, smooth, not painted with anything. Having picked up the "instrument", let's start checking its musical qualities.

Before starting the experiment, wash your hands well with soap and water. Then, slightly wetting the fingers of your right hand with clean water, put the glass on the table, and hold it firmly by the leg with your left hand. With the middle or index finger of your right hand, begin to drive around the edge of the glass. After a few seconds, you will hear a melodic sound. The sound will not stop as long as you run your finger along the rim of the glass. If you succeeded, pour clean water into the glass, a little short of the edge, and continue to move your finger. You will hear a sound much lower than without water.

Continuing circular movements with your finger, look at the surface of the water. Small waves formed on it. They originated from the oscillating, resonant walls of the glass. Now begin to gradually remove water in small portions. The sound gradually rises, and the highest will be with an empty glass.

Singing glass

Take now the second same glass and repeat the experiment with it, as with the first, but without pouring water. If you play each of them in turn, you will notice that the pitches of each of them are slightly different. Even a very small difference in the thickness of the walls of the glasses affects the frequency of their oscillations, the pitch changes.

Author: Rabiza F.V.

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