The so-called artificial rainfall experiment is to put a bowl full of ice on the boiling hot pot. Under the cold and hot confrontation, water vapor will quickly condense into small water droplets, forming artificial rainfall.

2. Pigment rainfall experiment

The raw materials needed for this experiment are simple: transparent open bottles or cups, food coloring and foam hand sanitizer water. First, add more than half a glass of water to the transparent bottle, and then squeeze in some foam hand sanitizer to cover the whole water surface. Then drop the pigment, and you can see the pigment falling from the water in columns.

This effect is similar to rainfall. Foam is similar to the effect of clouds, and pigment is similar to the effect of dust or water droplets. Only when the pigment accumulates to a certain amount in the foam will it penetrate the foam and fall into the water. The effect of this experiment is particularly intuitive and beautiful, and children like to play!

3. Ice cube experiment

Ice cube experiments are also children's favorite. It's cool to play with ice cubes in midsummer. Kaado often asks me to pour a bowl of water and put it in the freezer for him to observe and play.

4. Siphon experiment

The material of siphon experiment is also very simple, only one straw and two cups are needed.

Step 5 make a rainbow

In sunny places, let the sun shine on water droplets or water mist. Since the rainbow can only be seen with its back to the sun, it should be seen in the opposite direction of the sun. When the rainbow appears, it is clearer against the dark background.

6. Crawling water

This experiment is somewhat similar to the siphon experiment, but it is more playable. We mainly use the water absorption of facial tissue. Before doing this experiment, we can ask our children which materials are absorbent and which are not. Water-absorbing materials include rags, paper towels, brushes, etc. And non-absorbent materials include plastics, steel, etc.

7. Snowflake experiment

Snowflakes are common, especially in winter. Every morning when I go out, I can always see a layer of frost on the car, lawn and glass. When we look closely with the naked eye, we can see the shapes of some snowflakes, especially the observation effect of glass windows.

8. Water purification experiment

"Water World" is an experimental suite related to water, which just contains the material of water purification experiment, which is highly matched with what we have learned. It is very suitable for self-made water purification device to observe the water purification process.

9. Crystalline salt painting

We mix salt, sugar, oil, stone and water to see which ones are soluble and which ones are insoluble. At the same time, water cannot hold a solute indefinitely. If it is added too much, it will reach saturation state and can no longer dissolve solute.

10, blowing bubbles

Drop two colors of food pigments into a cup filled with water. Immerse two Chinese cabbage leaves in water dyed with different colors and let them stand for one night, and you can see that the Chinese cabbage leaves are obviously dyed with pigment.