Essay on a happy little experiment for children 350 words

Write down an experiment.

Once, the teacher left us a special assignment - let us use waste items to make a work with scientific and technological content.

I thought about it and decided to "build a ship". When I got home, I found waste styrofoam for the hull, old toothpicks instead of steel nails, blue pen drawings for the windows, and small red flags made with labels for Arowana oil. Everything is in line with the principle of waste utilization. A catamaran passenger ship was finally made.

I happily lowered the boat into the pool, but to my displeasure it floated on the surface of the water but did not move. How can I make it go?I pondered for a while.

Suddenly, my eyes lit up. One day not long ago, I was using a few soap discs, and while the boat was playing in the tub, I suddenly noticed that one soap dispers was moving, and the others were floating there. Intrigued, I picked it up and saw a small bar of soap stuck underneath it.

I thought to myself: Could it be this little piece of soap that works?yes, why not give it a try?

I cut off a piece of soap with a knife and stuck it to the bottom of the boat, but I didn't see the boat move. Huh?Why doesn't it work.

Oh, maybe it's stuck in the wrong place?I readjusted a few times, and it still didn't move, and at this point, I was a little disheartened. I thought forget it.

Just as I was about to give up, "I had to think about it for months, and ninety-nine times I was wrong, but the hundredth time I was right." This famous quote of Albert Einstein rang in my ears for a long time. Yes!

How can you give up halfway?I pulled myself together again and tried it again, and finally I dug a groove under the waterline at the stern of the boat and glued a small piece of soap to it. When the boat is in the water again, wow!

I saw it slowly drive straight ahead.

Looking at the boat, I muttered to myself, "Why does soap make a boat move?"Heard by the father on the side, he patiently explained: "It's because the surface tension of the soap is greater than that of water." It dawned on me.

Through this experiment, I learned that only by trying boldly can we succeed.

You have to think about it yourself, since you are happy, there must be a lot to write about, and that happiness is something that others can't do for you.

One day, I saw an introduction to the vinegar egg experiment on "Teenager**", that is, put the egg in a cup full of white vinegar for a few days, and the egg will have a magical change. This simple experiment filled me with curiosity. I decided to do this experiment myself.

I carefully dip the eggs into a glass filled with white vinegar. As soon as the egg was soaked in white vinegar, small bubbles appeared around it, and after a while, the bubbles gradually became denser. "Observe and record again the next day.

I read the newspaper tips and looked forward to the next day with joy.

Wow, it's transformed again! "The next day, I got up early in the morning and rushed to the experimental area. Lo and behold, there was a layer of milky white foam on the cup, and a few small white spots were faintly visible on the surface of the chicken shell.

Although there are still bubbles around the eggshell, there are obviously fewer bubbles than yesterday. I tapped the egg with my fingertips, and it was so soft that it looked like it was about to break.

On the third day, when I looked closely, I noticed that the light red rock-colored eggshell had turned white. It's amazing that the egg shirt has become completely soft. Why is that?

Let me tell you, the egg shell is mainly composed of calcium carbonate, and the ingredient of white vinegar is acetic acid, which can soften calcium, so the egg shell will slowly become softer. The final result was this white, soft vinegar egg.

The scientific experiment allowed me to verify my knowledge in practice and improve my hands-on ability, and I gained a lot from this interesting experiment.

Interesting little experiments.

When I was in English class, the teacher gave us a thrilling and interesting experiment - swallowing "fire" in our mouths.

As soon as the bell rings, the teacher leaves the classroom. I saw that she was holding a glass in her left hand, which contained a transparent liquid, and there were a few white things in the liquid, the teacher said that it was a pear piece, and then, she picked up a piece and lit it, and the flames burst up, and the male flame printed the teacher's face red, and the students were dumbfounded, but the teacher put it in his mouth as if nothing happened. "Ahh

I thought, "Teacher, what's wrong?" Isn't the teacher afraid of being hot?

At this time, the teacher deliberately opened his mouth for us to see. Hey, the pears are gone. The teacher said:

Ah, it's delicious! We didn't believe it, we shook our heads one by one, so the teacher asked me to give it a try.

I walked up to the stage and set fire to the two-centimeter-square pieces of pears that I had prepared in advance according to the method demonstrated by the teacher, and my heart was like fifteen buckets of hanging water - seven up and eight down, and the teacher said, "It's okay, as long as you put the pear pieces in your mouth, close your mouth immediately, and stop breathing for a few seconds!" "I got the courage to put the scorching pear pieces in my mouth and did as the teacher said, hey!

It's not hot, it's cool, it's delicious! I asked the teacher, "Why are the burned pears not hot in my mouth, but delicious?"

The teacher smiled and said, "This is because the pear does not contain much water, and after soaking in the liquor, the water further penetrates, therefore, after ignition, the alcohol outside the pear piece burns, and there is a lot of water inside for steaming, put the pear piece in the mouth, stop breathing, lack of oxygen in the mouth, the fire will be extinguished, and the mouth will naturally be fine." ”

After hearing this, the students were boiling, and they all wanted to swallow the "fire".

During a nature lesson, the teacher brought a handkerchief and some water, saying that he was going to burn the handkerchief.

At this time, the classmates talked a lot, and they all said that it would be a pity if this handkerchief was burned. Because this handkerchief is so cute - it has a cute kitten on it. But the teacher still has to burn the handkerchief.

Because the teacher said that the handkerchief was insured, the students were skeptical.

The teacher first put the handkerchief into the water, and then carefully struck the match and lit the handkerchief. Some students said, "The handkerchief will definitely not burn!" But the handkerchief burned and was very strong.

The teacher hurriedly buckled the bowl on the top of the handkerchief, let us guess what the handkerchief would look like, the students all said that it was burned out, everyone stared at the teacher, only to see the teacher take the bowl away, ah! The handkerchief is intact! At this time, the calm classroom erupted in thunderous applause, and everyone was talking about how the handkerchief would not burn out.

At this time, the teacher smiled and said, "Actually, I said that the handkerchief is on the insurance is a funny saying, the handkerchief that can't be burned is a certain reason, just now I soaked in 70% of the water is alcohol, the fire is alcohol, as long as the 30% of the water is not dry The handkerchief will not burn out."

It's fun to experiment!

My good buddy once told me that when raw eggs and cooked eggs spin, they have different shapes. I was curious to hear it and wanted to prove it with experiments.

I brought two plates, one egg on each plate. One is a boiled egg and the other is a raw egg.

The experiment began, I first put the eggs up and turned the cooked eggs in a clockwise direction. The egg immediately flew and spun like a spinning top. It also lasts for a long time, rotating upright and then horizontally until it stops.

Next, it's time to try raw eggs. What does it look like when it rotates? I couldn't wait to give it a try.

The method is exactly the same as the hard-boiled eggs just now. However, as soon as the egg began to turn, it immediately lay on the plate. And the speed of rotation is not as fast as that of hard-boiled eggs.

It looks fluffy when turned. After a while, the eggs stopped. It seems that there is a noticeable difference in the morphology of raw eggs and cooked eggs when they rotate.

Why is this so? I was puzzled. So, I looked up 100,000 Whys.

It turns out that the difference between raw eggs and cooked eggs is that the yolk in the raw egg is liquid, and when the egg is turning, the liquid yolk inside will keep shaking, so that the center of gravity of the egg is unstable, so it cannot rotate upright. On the contrary, the yolk inside the boiled egg is solid, so it turns like a spinning top.

It dawned on me when I saw it.

This trial was so much fun! It taught me another science.

,Weekend rest, you're not good,( Lalala?) 8。