The third grade scientific experiment composition is 300 words.

The third grade scientific experiment composition is 300 words (generally 72)

In study, work and life, when it comes to composition, everyone is certainly familiar with it. With the help of composition, you can vent your emotions and adjust your mood. I believe many friends are very upset about writing a composition. The following is a third-grade scientific experiment composition collected by Bian Xiao, with 300 words. Welcome everyone to learn from it. I hope it helps you.

Science experiment composition 300 words Grade 3 1

At the weekend, I was reading a book called Exploring Science, and found an interesting little experiment called "The bottle eats the egg".

I was dubious, so I decided to do this interesting little experiment. The materials needed are: an egg, a bottle with a smaller opening than the egg, a lighter and a piece of paper.

First of all, I lit a piece of paper with a lighter and immediately threw the burning paper into the bottle, only to see black smoke coming out of the bottle. Then, I took out the eggs and peeled them. This white and tender egg is as smooth as a baby's skin. I put it on the bottle mouth, and at this moment my heart was nervous and confused: "Does the bottle really eat eggs?" After a while, the bottle really ate the egg, and the egg fell into the bottle with a bang. I was so happy that I suddenly thought of a question: Why can a bottle eat eggs? Later, I found the omniscient "teacher"-encyclopedia. The teacher told me that because the egg blocked the bottle mouth, the paper towel burned in the bottle and consumed the oxygen in the bottle. The air pressure in the bottle is very low, and the air pressure outside is very high, so the bottle can eat eggs. After reading the encyclopedia, I suddenly realized. I finally know the interesting secret behind eating eggs in a bottle!

I decided to read more books and do more small experiments to popularize my extracurricular knowledge.

300 words for the second scientific experiment composition in Grade Three.

On Saturday morning, my mother said, "Today we are going to do a little experiment. Its name is' hot water blowing balloons'. " I said happily, "Great."

I took out two pots first, then one filled with hot water and the other with ice water, and prepared two balloons of different colors. Then I found a mineral water bottle, the bottle body was cut off in half, and a balloon was put in the bottle mouth. I thought nervously: can you really blow up a big balloon by putting a mineral water bottle in hot water? And can you really flatten the balloon by putting it in ice water? I put the mineral water bottle into the hot water with anticipation, and the balloon really got bigger. Look at this red balloon. It's like a big apple smiling at me. I shouted in surprise, "Wow, that's amazing!" Ok, it's time to put the mineral water bottle in the ice water. I will immerse the bottle in ice water. The balloon gradually flattened again, like a broken-hearted child. I am full of doubts about this. Why is this little balloon? My mother came over and saw my puzzled face. She said with a smile, "This is the phenomenon that heat expands and cold contracts. Because of the high temperature of hot water, put the mineral water bottle with a balloon in the bottle mouth in the balance filled with hot water, so that the balloon can absorb the heat of hot water. With the increase of temperature, the internal energy increases. The volume increases, gradually expands, and works externally, so the balloon expands. " After listening to my mother's words, I finally understand why the balloon will expand in hot water.

This experiment is really fun. You can not only learn knowledge, but also know the principle of blowing balloons. I like doing experiments.

Third grade scientific experiment composition 300 words

Do you believe that eggs can float on the water? Maybe many people don't believe it, but I want to tell you: "Yes!"

On Saturday, my sister and mother and I did this little experiment. We prepare experimental supplies: an egg, a glass filled with water, a small spoon and a jar of salt.

I started the experiment with great expectation. First, I gently put the egg in the glass. The egg slowly dipped into the bottom of the glass and lay there quietly, as if sleeping comfortably. Then, I took some salt with a spoon and put it down. I kept stirring, and the salt soon melted. I kept adding salt to the cup, and the egg seemed to wake up. I tilted my head up a little. I patted its head and it kept nodding. Soon the water became turbid, and the eggs gradually floated, turning round and round, as if dancing ballet on the water. I was so excited and ecstatic that a question appeared in my mind: what's going on? Why do eggs sink in clear water and float in salt water? My sister and I both feel incredible. Mom explained: Clear water becomes salt water after adding salt. The greater the density of water, the greater the buoyancy of water, so the eggs float.

Finally, my sister and I listened to my mother's words, and we all suddenly realized that scientific experiments made us feel interesting and gained knowledge from them.

300 words of science experimental composition in grade three and grade four.

Once, I saw an experiment in a book. The name of this experiment is "confetti dance". Can confetti dance? I was puzzled and decided to do this experiment once.

The materials of the experiment are: a pen and a blank sheet of paper. I first tore a piece of white paper into pieces, like kruimeltje. Then I took out a pen and put it on my head, rubbed it gently and made a "creaking" sound. It was polished after a while, and finally I put the pen on the paper. Guess what? The pieces of paper whirled and danced in the pen, as if they were attracted by gravity. Incredibly, I was sucked up by the pen, still dancing there, scrambling to stick to the pen, as if by magic. But I'm still so curious and full of questions. Why can I only dance?

My mother told me: "This is because the friction between the pen and the head produces static electricity, that is, static electricity sucks the paper away."

I finally know, The Secret Behind. It turns out that there are always many secrets hidden in life, and we can know the secrets of nature by observing them with our eyes that will discover.

The fifth scientific experiment composition in grade three is 300 words.

Recently, I did a scientific experiment called "Dancing Matchsticks".

I brought a basin of water, a match and a bottle of "all-purpose glue". I coated a thick layer of "all-purpose glue" on the match. Finally, I carefully put the match into the clear water. After waiting for a while, I didn't see any response. I calmed down and waited patiently. A few minutes later, the "miracle" really appeared! I saw matches standing upright in the water and dancing with the swing. However, in less than half a minute, the match floated on the water again, and a few minutes later, the match danced again. This cycle lasted seven or eight times, and the match never moved again.

What magical power drives matches to "dance"? Go through the books with this question. It turns out that when the "all-purpose glue" comes into contact with the phosphorus in the match head, it will produce a gas. More and more gas will make matches stand upright; When the gas volatilizes, the match is driven to dance. After a while, the gas in the outermost layer of the match head evaporated and the match stopped moving. After a while, the gas will gather again and the matches will "dance" again. At this time, I suddenly realized: "Ah! Matchsticks can "dance", so that's it!

The sixth scientific experiment composition in grade three is 300 words.

Today, my father and I did a small scientific experiment at home-a paid newspaper.

I prepare the materials for the experiment first: a pencil and a newspaper. I press half a newspaper against the wall in my left hand and hold a pencil in my right hand. I slowly wiped the pencil side of the newspaper, but as soon as I let go, the newspaper dropped, even less than 3 seconds. I quickly rubbed it again and tried it several times. No matter whether I put the newspaper horizontally or vertically, it just won't stick to the wall. I'm disappointed. Dad said, "I'll try it, too." The newspaper fell down in less than three seconds. I was still unwilling, so I changed places with my father and tried several times on the wall of the floor corridor, but the newspaper still couldn't be posted on the wall.

I asked my father, "Why can't the newspaper be posted on the wall?" Dad said: "There has been a lot of rain recently, the air humidity is too high, the static electricity generated by friction is too small, and there is not enough power to stick the newspaper on the wall." If the air is dry and there is a lot of static electricity in winter, newspapers can be posted on the wall. " I nodded and looked forward to the next experiment.

300 words of scientific experiment composition in grade three and grade seven.

When it comes to boiling water, everyone will definitely think of using a metal pot, but some people will use paper cups to boil water. Can you believe it? I have done this experiment.

The materials used in the paper cup boiling experiment are: a candle, a paper cup, a match or lighter, and a pair of chopsticks. First of all, you should put some water in the paper cup, not too much in a quarter cup. Then light the candle. The little candle is like a dancing elf. Then put the paper cup filled with water on the fire and burn it. After a while, the white bottom of the paper cup turned black, and there was an unpleasant burning smell. My heart began to feel uneasy: Will the paper cup really not be burnt? Will the water leak down and put out the candle?

Fortunately, I'm afraid it's all right. Soon the water in the cup will start to steam. I felt the water in the cup and felt a little hot. After a while, the water began to bubble. "The water is boiling!" I cried. Time is up, and the quiet classroom is boiling like water in a cup. The students are talking noisily. Some students said that it is impossible for water and fire to be incompatible. Some students asked why the paper cups wouldn't be burned. The principle of this experiment is that water will absorb heat when it turns into steam, so as long as there is water, the paper cup will not burn.

300 words of scientific experiment composition in the eighth day of junior high school

Now every family has electric lights, telephones, televisions, refrigerators and washing machines. Do you know what makes these appliances work normally? That is electricity. In science class, we learned some simple knowledge of electricity.

In science class, the teacher took out batteries, wires and small light bulbs. Let's do it ourselves and light the small light bulb. The teacher drew the principle on the blackboard, and then we did the experiment ourselves. I first connect the wire with the center of the small bulb and put the other end of the wire on the positive electrode of the battery. The current flows out from the positive electrode of the battery, passes through the wire, passes through the small bulb, and the metal sidewall below the glass bulb is connected with the wire on the inner sidewall of the small bulb, passes through the filament of the small bulb, passes through another wire, and flows back to the negative electrode of the battery through the wire at the bottom of the small bulb. At this time, the light bulb will light up.

This is the principle of our household lamp, except that a switch is connected in the middle of the wire to control it.

Through this experiment, I know that a simple circuit consists of four parts: power supply, switch, electrical appliance and wire. The two ends of the wire connecting the bulb are connected to the anode and cathode of the battery respectively to form a current path, so that the bulb will light up.

300 words of 9 scientific experiment composition in Grade Three.

In today's science class, the teacher said to us, "As long as the rubber band is tightly wound around your finger, it will turn purple."

In the morning, the Chinese teacher assigned us a composition "An Interesting Experiment". I'm trying to do an experiment. The teacher's science class is too timely. It's really "I can't find it anywhere, I can get it without blowing off dust." If I asked Xiaohong, Xiaoli, Xiaoming, Xiaojun and Xiaopang to do this experiment together, how wonderful and lively it would be! The bell rang suddenly, and I rushed out of the classroom to find Xiaoming and Xiaojun. I said, "Let's do the experiment that the teacher talked about in class just now." "good!" They clapped their hands and cheered. I first wrapped my fingers tightly with a rubber band, and then we found that my fingers really began to change color, from white to purple, and began to get cold. I was scared and thought something would happen. I quickly took off the rubber band, and I found that my fingers gradually recovered and returned to normal.

It turns out that the pricked part at the top of the finger is purple because the pricked part hinders the flow of venous blood to the heart, which makes venous blood turn purple after a long time of collection and then die. Children must not imitate yo, this is a dangerous action!

Science experiment composition 300 words Grade 3 10

In the afternoon science class, the teacher walked onto the platform with a smile. She said in a crisp voice, "Students, today we are going to do an experiment in which potassium permanganate is dissolved in water." After that, she gave each group a lot of cups, a small measuring cup and a small bottle of shiny purple-black potassium permanganate.

The experiment began. I took a small spoon, filled it with a little potassium permanganate, carefully took it to the mouth of the measuring cup, shook it gently twice, and potassium permanganate fell into the water. In an instant, a trace of purplish red floated from the "body" of potassium permanganate and danced lightly in the water like a ribbon. I put the stirring rod into the cup and stirred it back and forth. Slowly, the water in the cup turned purple, so beautiful that the students' eyes widened in surprise.

Then the teacher came up to us and said, "Potassium permanganate can be dissolved in water. However, when doing experiments, be careful not to touch them with your hands, otherwise the skin on your hands will fester. " We nodded thoughtfully.

It seems that science is not only interesting, but also there are some dangers in some experiments. Be careful when doing experiments!

300-word scientific experiment composition for grade three 1 1

In today's science class, the science teacher said that water has surface tension and can support objects to "float" on the water. I want to do an experiment.

I prepared paper cups, paper clips and water and began to do experiments. First, I fill the paper cup with water, and then put the paper clip on the water. I failed the first time. The paper clip sank. Failure is the mother of success, but I am not discouraged. I decided to try again.

I'll get another paper clip. I learned the last lesson. I thought: maybe I pushed too hard and broke the surface tension of the water, so the paper clip sank. So this time I put the paper clip on the edge of the cup and gently pushed it into the water. The paper clip floated on the water. I succeeded, and I have a feeling of success. Later, I "floated" other paper clips on the water.

We should not only do experiments, but also discover principles. This experiment also taught me a truth: no matter what you do, you must persevere in order to succeed.

Science experiment composition 300 words Grade 3 12

Today, the weather is sunny. I want to do a little experiment. The name of this little experiment is "the cup that won't leak". The first materials to be prepared are: water, cups and paper towels.

I first took out a cup and poured half a glass of water into it. Then, I measured the height of the water with a ruler, hmm! There is enough water, I think: since all the materials are ready, let's start. I took out a paper towel, put it on the cup and turned it upside down, yeah! The experiment failed. My water spilled all over the floor, and the paper towel fell to the ground. I thought to myself: What's the matter? I clearly heard that if you put a piece of paper on the cup and turn it upside down, the water won't leak. Am I wrong in any detail? Is it fake? Or is my paper not thick enough? I thought about it and decided to try again. I used two pieces of paper this time. I tried it first, and then I started the experiment. It worked! It worked! I cried happily when I found that it wouldn't leak backwards.

It turns out that the swelling force of the water surface makes the cup and paper completely closed, and the pressure of the water in the cup on the paper is less than the atmospheric pressure outside the cup. Since the paper is held by atmospheric pressure, the water in the cup will certainly not leak out.

Through this experiment, I understand how amazing science is!

Science experiment composition 300 words Grade 3 13

In the winter vacation, I went to the Science and Technology Museum, visited the advanced technology there and was fascinated by it. So, I came up with the idea of doing small scientific experiments. When I got home, I started the experiment without saying anything. First, I brought a piece of foam, a paper cup, scissors and double-sided tape. I started making. I cut off the protruding part at the bottom of the paper cup and fixed it with double-sided tape. I made a hole at the end of the foam near the bottom of the paper cup, and the hydrodynamic boat was completed. I filled another washbasin with water, put the boat into the washbasin and filled the cup with water.

Suddenly, an accident happened. Because of the unstable center of gravity, the boat capsized. I thought that the back of the boat was too heavy and the front was not reinforced, so I capsized. Find the reason, I put a small piece of wood in front and reinforced it with wire. At this time, if you pour water into the paper cup again, the ship will not sink, but will move forward smoothly. Through this incident, I understand that to do anything, you must study and think carefully before you can consider all the problems you will encounter and succeed.

Science experiment composition 300 words Grade 3 14

In this common sense class, the teacher gave us an interesting little experiment.

At the beginning of the class, I saw the teacher put a piece of soil on the asbestos net first, then put the asbestos net on the iron shelf, and put the alcohol lamp in the middle of the iron shelf to light it. A few minutes later, the originally wet soil dried up, and then, a wisp of smoke emerged from the clods with a little rancid smell. Textbooks say that clods smoke because there is humus in the soil, which is mainly composed of animal and plant remains. Then, the students did it several times and found that there was humus in each clod. As my father said, "99% of the earth's soil contains humus." That's not bad. At this time, the teacher put the burnt soil into a beaker filled with water and let it stand for a long time before some sediments and floating objects appeared faintly in the beaker. The teacher said that the coarse sand below and the clay above. The textbook concludes that soil is composed of water, air, humus, sand and clay.

After this lesson, I realized that the world is so wonderful, even a small piece of soil has so many secrets. It is really "endless learning"!

Science experiment composition 300 words Grade 3 15

Today, the teacher took us to do an interesting scientific experiment-friction electrification. On hearing the news, my heart is as sweet as honey.

The teacher first took out a rectangular piece of tissue paper, and then tore it into small pieces of paper and distributed it to us. Let's tear it into small pieces of paper. The little pieces of paper I tore off were like white ants. At this time, the teacher gave us a plastic pen to wear on our heads and wipe it back and forth. 10 seconds later, I gently put the plastic pen on the piece of paper. The paper flew to my pen like an enchanted spirit. It's amazing! Seeing this phenomenon, I am curious: "Will small pieces of paper really be enchanted?" Later, the teacher told us: "This is because the friction between the plastic pen and the hair produces static electricity, which sucks up the small pieces of paper." After listening to the teacher's words, I suddenly realized.

This experiment is really fun!

Science experiment composition 300 words Grade 3 16

Today, my mother and I did an interesting experiment ―― swallowing eggs in a bottle.

My mother and I found a bottle and an egg first. We light the cotton ball, throw it into the bottle, and then put the egg on the bottle mouth. After waiting for a few minutes, we found that the eggs on the bottle mouth did not change at all, and the bottle mouth could not swallow the eggs at all.

I asked my mother, "Mom, why is this happening?" Mother said, "You should peel off the eggshell." I asked again, "Why is this?" Mom replied, "This is because of atmospheric pressure. Put the lighted cotton ball into the bottle, and then block the bottle with eggs, and the oxygen in the bottle will gradually disappear. The atmosphere outside the bottle will squeeze the eggs and put pressure on them. Finally, squeeze the eggs in. "

I did it again as my mother said. This time, I held back my temper and the eggs were slowly sucked into the bottle bit by bit.

I ran to my mother and said, "Mom, mom, look, the eggs have been sucked in. I jumped up with joy and shouted, "I succeeded, I succeeded!" " "

Science experiment composition 300 words Grade 3 17

I saw "exploding eggs" in my circle of friends this morning. To verify, I decided to do an experiment.

The thing is this: the teacher asked us to prepare eggs, take out a tool, poke a hole in the head and tail of the eggs, and then blow out the undercooked eggs, leaving only the eggshell.

I also did as the teacher said. First, I take out my tools. I poked holes on both sides and found that the hole would break when I poked it for the first time, because there was no trace of the hole. When I poked the hole carefully for the second time, the eggs were so harmless that I understood a little. However, to my surprise, when I was about to blow out the eggs inside, the eggs suddenly exploded! "

I was puzzled at the time, too. Why did it "explode" It turned out that it was because I put the egg in the hand below and used too much force that it rotted. But I saw the people in the class succeed again. But his hand is too hard, which makes me feel even more strange. This "Millennium mystery" has not been solved yet.

Through this experiment, I want to say: "There is no end to learning, and there is no end to learning." Learning is everywhere at any time. I also want to say to myself: "study hard and make progress every day!" " "