What are the interesting scientific experiments?

Recommend a book "Intelligent Happy Valley 488 Interesting Science Experiment Games"

This is a thick book with many interesting experiments. I borrowed it from the school library. Even if I don't do the experiment, it's very enlightening.

The following are other small experiments extracted from the Internet:

1. Swallow eggs at the bottle mouth

Practice: put some sand in the jar and put the burning alcohol cotton in the jar. At this time, you will find that the eggs stuffed in the bottle mouth are quickly swallowed into the bottle.

2. Perforated paper can hold water

As we all know, anything with holes will leak. Now, however, you will see a thin piece of paper full of holes, which can actually lift one kilogram or even two kilograms of water without leaking.

1

A big empty bottle, a piece of paper with many small holes punched with a big needle, and a large glass of colored water.

2. Performance process

Fill the big empty bottle with colored water; Cover the bottle with perforated paper, press the paper with your hand, turn the bottle upside down, as shown in the figure, and then gently remove your hand. The paper still covers the bottle mouth, and water doesn't flow out of the hole.

When performing, you should pay attention to the small mouth of the bottle (such as a big mouth bottle and cardboard). The more water you hold, the better the effect. After pouring the bottle, move your hands slowly and gently to avoid paper leakage or even pouring water out.

explain

A thin piece of paper can hold up the water in the bottle, because atmospheric pressure acts on the paper, producing upward tension. Water will not leak out from the small holes because water has surface tension, and water forms a water film on the surface of paper, so water will not leak out. This is like an umbrella made of cloth. Although this cloth has many holes, it still won't leak rain.

3. Convex lens imaging.

A magnifying glass (convex lens), a piece of white cardboard, a candle and a box of matches.

1, paste white cardboard,

2. Candles are lit and arranged in the same line with the erected white cardboard.

3. erect a convex lens between the white cardboard and the candle.

4. Adjust the distance between the white cardboard, convex lens and candle, so that there is a clear reflection on the white cardboard.