Soap bubble flies. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Soap bubble flies. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

Blow out a large bubble, 20 centimeters in diameter. With a light push, separate it from the tube. The bubble will first rise a little upward and only then, shimmering with all the colors of the rainbow, will it begin to descend. Finally, it will burst, touching the floor.

Why did the bubble rise in the first place? Yes, because it was filled with your hot breath. The warm air in the bubble was lighter than the air in the room. But then it cooled down and the ball went down.

A very beautiful flying bubble experience can be done in a large glass jar. At the bottom of the jar, put a small cup with pieces of chalk. Pour the chalk with a solution of hydrochloric acid (1 part acid to 10 parts water). Once on the chalk, the solution will sizzle, bubbling, bubbling. Wait for the boiling in the cup to end. Then the air in the jar will become calm.

Blow a small bubble, but without a drop at the bottom, and shake it into a jar. First, it will fall almost to the very bottom, and then it will stop and begin to rise. It will rise a little, then down again, and again not to the bottom, and rise again ... The bubble dives like a float in a pond. Finally, it will stop at a small height above the bottom of the can. This is where the bubble will start to change colors. Look, here it is light blue, then green, yellow, then it turns red, crimson ... Finally, the bubble becomes purple, sinks lower and lower and ... the end! The bubble bursts, usually before reaching the bottom.

Soap bubble flies

What's the matter here? Why does a bubble fly in a jar, in the waves of what invisible pond does it dive like a float? The secret is that the action of hydrochloric acid on chalk produces carbon dioxide. It is colorless like air, but heavier in weight and therefore settles to the bottom of the jar. And the bubble is filled with air, it is lighter! That's why he emerges in an invisible pond. But gradually carbon dioxide passes into the bubble through its thin shell. And then the bubble sinks.

Author: Galpershtein L.Ya.

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