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三年級英語作文：一次有趣的科學(xué)實驗（通用10篇）
在日常生活或是工作學(xué)習(xí)中，大家都經(jīng)常接觸到作文吧，作文是人們以書面形式表情達(dá)意的言語活動。相信很多朋友都對寫作文感到非常苦惱吧，以下是小編收集整理的三年級英語作文：一次有趣的科學(xué)實驗，供大家參考借鑒，希望可以幫助到有需要的朋友。
三年級英語作文：一次有趣的科學(xué)實驗 1
In ancient times, many people believed the earth was a flat disc. Well over 2,000 years ago; the ancient Greek philosophers were able to put forward two good arguments proving that it was not. Direct observations of heavenly bodies were the basis of both these arguments. First, the Greeks knew that during eclipses of the moon the earth was between the sun and the moon, and they saw that during these eclipses, the earths shadow on the moon was always round, they realized that this could be true only if the earth was spherical, If the earth was a flat disc, then its shadow during eclipses would not be a perfect circle; it would be stretched out into a long ellipse. The second argument was based on what the Greeks saw during their travels. They noticed that the North Star, or Polaris, appeared lower in the sky when they traveled south, in the more northerly regions, the North Star appeared to them to be much higher in the sky. By the way, it was also from this difference in the apparent position of the North Star that the Greeks first calculated the approximate distance around the circumference of the earth, a figure recorded in ancient documents says 400.000 stadium, thats the plural of the world stadium. Today, its not known exactly what length one stadium represents, but lets say it was about 200 meters, the length of many athletic stadiums. This would make the Greeks estimate about twice the figure accepted today, a very good estimate for those writing so long before even the first telescope was invented.
三年級英語作文：一次有趣的科學(xué)實驗 2
After dinner on Saturday, my mother asked me a question: Will water and oil melt together? I dont know, so I want to do this experiment myself
I first filled a cup with some water, then poured a little oil into the water and stirred with chopsticks. The oil floated on the surface of the water and dissolved with water. Why is this? I quickly checked the "Chinese Childrens Encyclopedia" and found out that oil has a lower density than water, so oil always floats on the surface of the water. After a period of time, alcohol and water will melt together because the diffusion between alcohol molecules and water molecules is the result of chemical reactions. This effect is stronger between water molecules and alcohol molecules, while weaker between oil molecules and water molecules. Therefore, the diffusion between oil and water is slow, and oil always floats on water.
I discovered the secret of oil and water, and understood that science is not mysterious, and truth is not far away. As long as you observe carefully, you can discover science and draw conclusions.
三年級英語作文：一次有趣的科學(xué)實驗 3
Today, my mom and I had an interesting buoyancy experiment. First, I took a glass and half a cup of water. Then, I took a raw egg from the fridge and put it in the glass. I found that the egg quickly sank to the bottom of the glass. I started adding salt to the glass and slowly stirred it with chopsticks. I found that the egg still sank to the bottom of the water. My mom asked me to continue adding salt, so I stirred while adding salt. Finally, I found that the egg was floating in the water, which was amazing.
My mother told me that this is because after adding salt to water, its specific gravity is higher than that of eggs, so the eggs float up. I dont understand what specific gravity is, but my mother said I will know when I enter junior high school in the future.
三年級英語作文：一次有趣的科學(xué)實驗 4
Today, the teacher asked us to go home and do an experiment on an electrified newspaper. I am very anxious to know how newspapers are electrified, so as soon as I get home, I quickly prepare the materials. I need to do an experiment.
The experiment started. I first unfolded the newspaper and laid it on the wall. Then, I rubbed the side of my pencil against the newspaper a few times. As soon as my hand loosened, the newspaper fell off and the experiment failed. Im very sad. I think the teacher must have lied to us. How could the newspaper be stuck on the wall?
Mom asked me to tear down the newspaper a bit, and we started experimenting again. I spread the newspaper torn into a quarter on the wall and rubbed it repeatedly on the paper with the side of my pencil. After a few times, the newspaper was stuck on the wall. Im so happy!
After mastering the method, I pasted several newspapers on the wall, big and small. My houses walls were covered with newspapers of all sizes, colorful and beautiful. My mother smiled happily.
三年級英語作文：一次有趣的科學(xué)實驗 5
Yesterday, I conducted a very interesting experiment with materials including a glass of water, a glass of vinegar, and two hard shelled raw eggs. Put one egg in a cup filled with water for 24 hours, and another egg in a cup filled with vinegar for 24 hours.
This morning, I felt the egg in the water and it was as hard as before, but the egg in vinegar had become soft and elastic. I thought it could really "jump" like a ball, so I gently released my hand and the egg fell to the ground and broke. At that time, I was thinking about how hard I had been soaking it all day and night. Then my mother came and said, "Child, do you really think it can jump like a ball? If you gently throw it in the sink, it will bounce." So I soaked another egg again and saw if it could jump in the sink!
三年級英語作文：一次有趣的科學(xué)實驗 6
This morning, my father took a boiled egg and asked me to do an experiment where the egg floats in water. We have prepared two bowls of water, one bowl of tap water and one bowl of melted salt!
The experiment has begun. I saw my father put two boiled eggs into two separate bowls. A miracle really happened. One egg floats in saltwater, while the other sinks to the bottom of the sea. I asked my father strangely why. Dad said that because the density of melted saltwater is higher than that of eggs, it will float on the water surface! Thats also why people who cant swim can float on the Dead Sea! I will learn density and buoyancy in middle school physics class.
This experiment is very interesting, actually I really want to go to the Dead Sea and experience the feeling of floating on the water surface! ha-ha
三年級英語作文：一次有趣的科學(xué)實驗 7
Today, I gave my parents a difficult problem that stumped them. I put some water on a plate, lit a candle, put it on the plate, took out a fork, and put it on the plate. I asked them not to touch the water, not to blow it with their mouths, and also to extinguish the candle.
My parents said in unison, I dont know. So, I took out a glass and put a button on the candle. After a while, the water in the plate was sucked into the glass and the candle went out. So, I picked up the fork.
This is because candles consume the oxygen in the cup, causing the pressure inside the cup to decrease. Then, the outside air pushes the water pressure from the plate into the cup.
三年級英語作文：一次有趣的科學(xué)實驗 8
Today, Teacher Chen assigned an experimental assignment.
As soon as I got home, I went to the kitchen and took out an egg and a bottle of white vinegar.
The experiment started, and I couldnt wait to pour vinegar into the cup and then put the eggs into the white vinegar.
I stared at the egg intently, but for just over ten minutes, the eggs body was covered in bubbles. I touched it in surprise, like a cotton ball. Two or three hours later, when I touched the eggs, they were all soft. I jumped three feet high and shouted loudly, Mom, the eggs have softened! Mom was very happy to hear that.
Why do eggshells become soft? I searched online for information: the surface of eggshells is calcium carbonate, and vinegar is acidic. Calcium carbonate reacts chemically with acid, causing the outer layer of eggshells to dissolve and soften. This experiment is really interesting!
三年級英語作文：一次有趣的科學(xué)實驗 9
The sunshine today is really good! Through the glass under the sunlight, bright. Dad said we should do an experiment on "making a fire with a magnifying glass".
Firstly, we brought a piece of paper, a match, and a magnifying glass. We put the paper on the stool, then placed the matches on the paper, and illuminated the matches with a magnifying glass. When the magnifying glass is far away from the match, the aperture on the paper is very large. As the magnifying glass gets closer to the matchstick head, the aperture becomes smaller and smaller. When the magnifying glass is about 6 centimeters away from the matchstick head, the aperture becomes a dazzling light spot. Soon, the matches began to smoke. After a few more minutes, although the matchstick did not catch fire, it became increasingly bright. At this moment, I curiously moved the paper and only heard a "pu" sound. A red flame jumped out, startling me. The magnifying glass can really make fire! "I shouted.
What an interesting experiment today!
三年級英語作文：一次有趣的科學(xué)實驗 10
Today, as soon as I stepped into the classroom, there were sounds coming from my classmates discussing whether eggs would float in saltwater?
Its time for class! The teacher walked into the classroom with salt, a glass of water, a spoon, chopsticks, and eggs. The teacher smiled and said, "Today, lets try if an egg floats in salt water." The teacher first put the egg into a cup, then added a small amount of salt and stirred it with chopsticks. After stirring, the egg did not float up. Finally, the teacher added a large amount of salt and continued stirring. Eggs suddenly popped out of the water, and the classmates next to them also let out exclamation.
The teacher told us that adding a large amount of salt to clean water increases its density and buoyancy, causing the eggs to float up.
In fact, there is a lot of knowledge in life, as long as we have exploratory eyes. You will discover the infinite mysteries of nature.
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