Scientific experiment is our favorite parent-child early education activity.

In the last week of the holiday, I took Dabao and Bauer to do many scientific experiments.

Every experiment will bring them unexpected results. In their eyes, these experiments are like surprise' little magic'.

When they see these wonderful reactions, they will also be curious, ask why, and be interested in the principles behind them.

Curiosity and interest are the best teachers.

Let's take a look at some simple and magical scientific experiments.

1. self-propelled ship

Put a piece of paper into the water, and it will stand still without external force.

How to make small pieces of paper move? Just add detergent to the end of the paper. Put a small piece of paper with detergent in the water, and the paper will "run automatically" like a boat with a motor.

This is because detergents are surfactants, which can reduce the surface tension of water.

The surface tension of the end with detergent is smaller than that of the end without detergent, so the paper will be attracted by the surface tension of the other end and move forward.

Step 2 run pepper

Add water to the plate, and then add some pepper.

At this time, if you reach into the water with your bare hands, your hands will be covered with pepper.

How to avoid peppers perfectly? Just put a little detergent on your hands.

The experimental principle is the same as the previous one. The surfactant in the detergent reduces the tension of the water surface, making the surrounding water with stronger tension' pull' the surrounding water away, and the picture of pepper fleeing appears.

3. Hongqiao

Color both ends of the paper towel, and then immerse the colored end in water.

Slowly, the color that was originally only at the two ends of the paper towel will' climb' a whole piece of paper to form a rainbow bridge.

This is because paper towels contain a lot of plant fibers, which are like a capillary. Water is absorbed by these small tubes and slowly occupies a piece of paper.

4. Swimming fish

Dry the sink, and then draw some small fish, crabs and tadpoles on it with a marker. After turning on the tap, these little animals actually moved in the water and swam happily.

Do you feel like a magic pen and a horse? Secrets are hidden in pens and ink, because pens and ink contain adhesives. When the painted animals are dry, a thin layer of mucosa will form on the surface.

In addition, pen and ink are insoluble in water, and after adding water, the small fish with whiteboard pen will come alive. This scene will definitely make children scream with excitement.

5. water cup

Pour water into the dish and add a little pigment for easy observation.

Light the candle and put it in the middle of the plate. At this time, the candle floats on the water.

Then put the glass upside down on the candle. After a while, the candle went out and all the water flowed into the glass.

Candles need oxygen to burn. After the candle was hung upside down, the oxygen in the cup burned out.

Without oxygen, the candle will go out, and at the same time, because there is no oxygen, the pressure in the cup will be reduced, and the stronger air pressure outside the cup will push the water from the plate into the cup.

6.magic water cup

Draw two arrows on the paper. When there is no water in the cup, the direction of the arrow does not change.

After adding water to the cup, the arrow completely changed direction, which is due to the refraction of light.

A cup and water are like a concave lens. Light is refracted by a concave lens, and all light will change except the light passing through the optical center.

7. Water that won't overflow

The water in the glass is obviously full and almost overflows. At this time, add another coin, add another one, and the water has not overflowed.

The secret is that water has certain viscosity and tension.

When coin is put in, although the water level rises, the water at the edge of the cup can be said to be the tension of the water surface because of the viscosity between water molecules, thus keeping the connection.

This forms an invisible "Shui Pi", and this layer of "Shui Pi" will prevent water from flowing out.

8. Powerful playing cards

Put a playing card on the edge of an empty cup. Put a coin at this time, and the playing card will drop immediately.

However, fill the cup with water, then put the playing cards on the edge and put the coins in. At this time, the coin did not fall.

Playing cards can hold so many coins.

It's amazing. What makes playing cards bear the weight?

There is tension on the surface of the water, and it is this' power' that pulls the playing cards.

9. Volcanic eruption

Add baking soda and a few drops of paint to the plate to enhance the appreciation.

At this time, vinegar was poured in, and the originally flat surface began to have the effect of volcanic eruption.

When baking soda meets vinegar, it will have an acid-base reaction and produce a lot of gas.

10. fluctuation experiment

Prepare all kinds of small objects and a basin of water. Will these objects sink or float?

Let the child guess before putting it down.

Every object has its own density. If the density of an object is greater than that of water, it will sink; if it is less than that of water, it will float on the water.

1 1. Melt the ice.

Add the same amount of ice to the cup and let the children think about how to melt the ice faster.

You can add salt, you can heat water, you can also put it in the sun ... these are the ways that our family Dabao came up with.

12. Running color

Put a little milk on the plate and then drop the paint.

The density of milk is slightly higher than that of pigment, so the pigment can temporarily float on the surface of milk after being added. After adding detergent, the surface tension of pigment drops rapidly, forming diffusion effect.

The color of running will definitely surprise the children.

13. The growing caterpillar

Colour the paper towel, then roll it into small columns with chopsticks, and it will become shorter when rolled.

At this time, you can ask your child to drop some water on the paper towel caterpillar with a dropper. The caterpillar actually becomes longer after adding water.

This is because paper is water-absorbent, and when it meets water, it will absorb water and expand.

14. Small sprinkler

Poke a few small holes under the mineral water bottle and fill the bottle with water.

If the lid is tightly closed, water won't gush out from the small hole in the lower part of the bottle. If you open the bottle cap, water will gush out from the small hole.

When the bottle cap is closed, the liquid level at the hole is communicated with the outside atmosphere, so at this time, the liquid level at the hole is suppressed by the atmospheric pressure, and no water will flow out.

After opening, the liquid level under the bottle cap is also affected by atmospheric pressure, and some water flows out.

Do these little experiments look simple and fun? Try it with the children.

About the author

Rachel from Holland has three babies (4 years old /2 years old/1 year old). Share daily life with Sambo, explore early education games that are entertaining and entertaining, and give high-quality companionship to babies in a simple and warm-hearted way. Wechat official account: There must be my thoughts on the trip to Kids3Go.