1. A 400-word essay on water experiment

1. On Sunday, I was doing my homework alone at home. While I was doing it, I wanted to play, so I brought a water cup, poured a cup of water, and did a water experiment.

I first filled the cup with water, and then went to the bathroom to squeeze out a little hand sanitizer. The little hand sanitizer was ready to move in the clear water. I walked to the desk with the cup again, poured red ink into the cup, and the water suddenly turned orange-red. I stirred the water a few times with scissors, and suddenly the smell of hand sanitizer came to my nostrils. Look at the glass of water, which is still orange-red, but with some added foam. Then I poured a little pure blue ink into the cup, and the orange-red suddenly turned into green. How strange! I stirred a few more times, but nothing changed. I tried pouring the glue into the water, and then poured the water in the cup into the basin little by little. I continue to do my homework. When I finished my homework, I found that the water in the basin turned purple and dried and stuck to it. I thought: What looks green in the glass of water, why does it turn purple when poured into a basin? It's strange that it can still stick to things! Later, I did various color experiments, and finally I poured them on the paper and it became a colorful painting.

You haven’t seen the experiment I did. In fact, I don’t know that the result of this experiment will be like this. This experiment helped me understand some principles of color mixing in paintings. I am also proud of this experiment, because I did an experiment that I invented alone.

2. This afternoon, my mother and I worked together to do a small experiment about water. Water is the most common liquid we see, so what’s the mystery about it?

My mother and I filled the cup with water, leaving no gaps, and could still put a lot of coins in. Do you think it is possible? I answered maybe, why? You will know after reading it.

I took a 1-cent coin. I was very nervous and impatient, so I gently put it down. Just listen to the sound of "dong", a coin lies safely at the bottom of the cup, and the water does not flow out at all, how amazing! I released the first one, and the second and third ones were also released quickly, faster and faster. Do you know how many I released in a row? Twenty-one.

Why can such a full glass of water hold so many things? The computer teacher told me the answer: It turns out that water has tension, and it is tension that allows water to hold so many things.

It’s amazing how a little tension can have such a big effect! 2. A 500-word essay on water boiling experiment

I want to write an essay of my own today.

But the experimental results shocked me. Haha, I immediately found all the tools to do the experiment and couldn't help but laugh out loud.

This is why the carton is intact. When I got home, I was immediately too scared to speak.

"Use paper to fold a carton that can hold water. After a few dozen minutes, my father just suddenly said "Oh", and I realized that I was wrong. Let them know, and asked with concern, What's wrong with you?

Dad became angry when he heard my laughter! Before I knew it, there might be something new. It was simply a matter of keeping an eye on the things around me. Observation, for exploration?" After listening to my father's words.

There was a sound, and the conditions for water to boil, water can be boiled, and the second is to continue to absorb heat. I was stunned by what I saw, but I thought of what my father just said and felt funny again, but the carton was intact: First, it reached the boiling point.

Do you understand? Fill it with water and put it on the flame of an alcohol lamp to heat it. I thought to myself, I also have this ability, dad walked into my room, so the heat transfer continued! , I started to back off, do you believe it? "I glanced at Dad aggrievedly! Have you encountered any problems? The temperature of boiling water is only about 100 degrees: "The burning degree of paper is more than 180 degrees.

The water started to boil, and there was a ball of fire-burned black under the carton, and then we were waiting to show off our skills... However, our eyes were wide open, and the teacher asked us to write An essay about scientific experiments, I understand, I am good at thinking about things: "Zimei. But before writing the essay, you must do an experiment first.

I had no clue at all, and then lowered my head I started thinking deeply, pursuing the "unknown" among the "known".

At this time, the rest of the place was safe and sound.

After a while, he told me the cause and effect of the matter. He looked at my frown, and my father explained with a smile? "Dad's sudden words startled me, and then my body started doing experiments involuntarily. 3. Essay about describing experiments

This afternoon, the first class was a science class. We made metal This experiment involves thermal expansion and contraction.

Prepare a basin of water, a copper ring, a copper ball, an alcohol lamp, and a lighter. The teacher first opens the lid of the sprinkler lamp and lights it with a lighter. Alcohol lamp. Then take the copper ring and put the copper ball in the middle of it to see if it can pass or not. The teacher said to us: "Did the copper ball pass through the copper ring?" "We said in unison: "It just passed. "Then the teacher put the copper ball on the alcohol lamp to burn. After ten minutes, the teacher put the copper ball into the middle of the copper ring again, but the copper ball couldn't pass through. The teacher put the copper ball into the water basin again, only There was a "squeak" sound. The teacher put the copper ball into the middle of the copper ring and passed it again. The teacher took the lid of the alcohol lamp and turned it off. Everyone was confused. The teacher explained: " The copper ball just passed through the first time, but the second time it couldn't go through because the copper ball was burned and heated by an alcohol lamp and expanded in volume. The third time, I put the copper ball into the water. When the water cooled down, the copper ball shrank in size and could pass through again. This is the reason why metal expands with heat and contracts with cold. The teacher also said: "Except for copper, many other objects will expand and contract with heat." For example, thermometers are made using this principle. ”

What an interesting experiment. Not only do I know that metal shrinks when heated and cooled, but I also know that it has great uses 4. Paper cup boiling water experiment essay 6o0 title

Title : Paper cups can boil water. Do you believe that paper cups can boil water? Then I will show you how to do it.

Today I came to Dad’s company and found some alcohol. Lamp and paper cup, first pour some cold water into the paper cup, light the alcohol lamp, and start heating. At first, my father told me to let the paper cup heat evenly, and then fix the heat in the middle, so that it will not burn.

I heated it for a while and heard a "squeak" sound, and the edge of the paper cup caught fire. I quickly blew it out. My father said to me: "In the middle of heating, because the water absorbed the heat, the edge of the paper cup It protrudes and cannot come into contact with water. Water cannot absorb heat in time, so the edge will stick. Also, it cannot be heated by high fire. In the same way, when heated by high fire, the water will not have time to absorb heat, and the paper cup will burn. "Oh! So that's it. I pointed the fire at the middle of the paper cup and continued to heat it, and sure enough, the paper cup didn't burn anymore.

After a while, the water started to steam, "It's open!" It's open! "I called my father, and he said to me: "Do you believe that you can boil water by stacking A4 printing paper into a cardboard box? "I completely believe it," I replied decisively. Then I verified the experiment.

Through computer inquiries, I learned that the boiling point of water is 100 degrees, and the ignition points of wood paper, tissue paper, hemp paper, and straw paper Around 130-250 degrees. Through experiments, I know: because the heat of the paper is absorbed by the water under low fire, the paper has not reached the ignition point when the water reaches the boiling point, so the paper will not burn.

If you don’t have an iron pot when boiling eggs, you can also use this method!

┏ (^ω^) = 5. An essay describing an experiment

Elementary school Science has always been my favorite subject in junior high school.

I have done countless experiments in science class, but among these countless experiments, there is only one that remains fresh in my memory, and that was just recently. The coin experiment I did. In the science class that afternoon, the teacher announced to us: "Today, I am going to do a very interesting experiment with you! ""yeah! "As soon as the words fell, the students cheered.

"Is it an experiment of putting coins into water? "A classmate had no idea. "That's right! Who among you has coins? ""I! I! I have! "The students all scrambled to "hand in" their coins one after another.

The experiment began, and the teacher threw coins into the full water glass. I squeezed in front, opened my eyes wide, and pressed tightly. Staring at the water glass, I was afraid of missing any small link. "One, two, three..." One coin after another "jumped" into the water glass, and the water level was also rising.

The teacher suddenly stopped and asked: "Students, guess what will happen next?" "The water will overflow!" the students said in unison. "Wrong! Let's continue reading!" "Who still has coins?" The teacher "searched" for six more coins on the students and carefully put them into the water one by one. The last coin "plopped" After entering the water, like a well-trained diver, it rotated 360 degrees in the water before falling safely to the bottom of the cup.

At this time, the students were surprised to find that the water surface exceeded the mouth of the cup, and it was half a centimeter! The classmates immediately surrounded the teacher and asked what the reason was, but the teacher gave it a try and asked us: "What do you think?" We were all monks who were two feet tall - scratching our heads. After repeated inquiries from the students, the teacher finally opened the "Golden Mouth" and said mysteriously: "This is the tension of the water surface. It is this invisible force that supports the water surface to exceed the mouth of the cup without overflowing."

That’s it! We finally understand why. This experiment taught us that we cannot draw arbitrary conclusions about anything. Only by having the courage to explore and practice can we uncover the answer.

There are still many secrets in nature. I believe that as long as we continue to explore, we can solve many mysteries. Remember an interesting little experiment. I have been very curious since I was a child, especially about flying. I most hope to be able to glide in the sky, so I like flying very much. It was noon, and I was playing with the golden cloth in front of me boredly. As I was playing around, I suddenly had an idea: Why not do a parachute experiment with this piece of cloth? I just did it. I immediately found four strings of the same length and tied them to the four corners of the cloth. Tie them up. I tried to pull the four strings. After making sure there was no problem, I found a small toy and tied the four strings to the toy. When everything was ready, I excitedly climbed up to a higher cabinet and stood up. , grabbed my parachute and the paratrooper, and waved my hand. I originally thought that the parachute would fall steadily. However, unexpected events caused the paratrooper to droop in a straight line. In the end, he failed to land safely and died heroically. I was stunned. : How could it be possible that the experimental product was wrong? I jumped out of the cabinet without thinking, grabbed the paratrooper, looked left and right, and there was no problem. After thinking for a long time, I finally came to the conclusion: the toy was too heavy. So, I immediately changed it. I made a lighter toy, tied the rope to the toy, and tried it again, but the result was that the paratrooper ended up in the same tragic way. I was very confused whether there was still a problem. At this time, a breeze blew, and I had an idea: it must be There was a lack of wind power. So, I carried the paratrooper again and went to the top floor. A gust of wind happened to blow. It was a little late and then it was fast. I quickly dropped the paratrooper. Hey, it was amazing! As soon as the parachute opened, the paratrooper landed slowly on the ground and landed safely. I cheered, rushed downstairs, picked up the paratrooper, and shouted excitedly: "I succeeded! I succeeded!" Although this was only a long time ago. It was a small experiment, but it was deeply imprinted in my mind. Whenever I encounter difficulties, the parachute and paratroopers always appear in front of me, prompting me to overcome various difficulties. In life, Difficulties are like a spring. If you are strong, they will be weak; if you are weak, they will be strong. Therefore, as long as you do not bow in the face of difficulties, no matter how powerful the difficulties are, you will only be defeated! Remember an interesting little experiment. This Sunday afternoon, I was bored and could only sit in a chair in a daze.

Dad seemed to see through my mind and said, "How about Dad do an experiment with you?" When I heard this, I jumped up with excitement: "Then what are you waiting for? Go quickly!" So, my father pulled me into the kitchen, turned on the faucet, and said to me: "Look at this water, it flows straight down. Can you make it turn?" I thought: It is impossible to make it turn. Dad will definitely not be able to do it. I said, "I can't.

Can you?" Dad smiled and said, "Look!" He took a spoon and wiped it with a piece of woolen cloth. , in this way, the spoon is charged with electricity. Dad put it close to the thin stream of water, ah! The water turned around and approached the spoon.

What's going on? Does dad have magic? Dad noticed my confusion and said: "Let me tell you: the spoon is attracted to the uncharged water flow. Once the spoon touches the water flow, this little experiment will not succeed.

Water It is a conductor and can conduct electricity away from the spoon instantly! Even water vapor floating in the air can be charged.

Do you understand? "I nodded in understanding.

"Come and try it too! "He gave me the spoon. I did it the same way my father just did, ah! The water flow really turned! I also became a "magician".

This experiment is really interesting. Remember it once. Interesting little experiment. I am a little boy who loves to explore new things. I once heard that after cutting an earthworm into two pieces, it will not only not die, but also become two living earthworms! To prove this, I did an interesting little experiment.

My classmates said that earthworms can be found everywhere after a rain. One day after a shower, I found an earthworm by the flower bed without any difficulty. After I got home on Friday, I took out my utility knife and put the earthworms on a piece of paper, thinking confidently: I will be able to successfully complete the experiment.

The experiment began, and I carefully placed the earthworms. Cut it in half and take a closer look. Why does the earthworm seem to be dead and motionless? I am very discouraged: Did my experiment fail? 6. Ask for an interesting essay. The experiment must be written by yourself

An unforgettable scientific experiment

Life is a charming painting that outlines many interesting stories; life is a melodious piece of music , how many pure and beautiful fantasies have been played; life is a bouquet of gorgeous jasmine, the hearty laughter is like the intoxicating fragrance of jasmine, and the blossoming white petals are like memories, among which there is a circle. The small petals in the shape are always floating in my heart.

One day, the science teacher Lu walked into our classroom with a bunch of experimental instruments and said to us with a smile: "Students, this is it." In the first lesson we are going to do an experiment, the theme is 'boiling'. "The students cheered. Teacher Lu gave each group experimental instruments, including a 50-scale beaker, a thermometer, a triangle, a silk mesh and an alcohol lamp. The teacher asked us to fill the beakers with 30-scale water , and then use a thermometer to measure the temperature: “15 degrees. "After the students in our group wrote down the temperature, I spread the silk mesh on the triangular frame and put the beaker on it. After Teacher Lu used a lighter to help us light the alcohol lamp, I pushed the alcohol lamp into the triangular frame and added water. Then put the thermometer into the beaker and measure the temperature of the water. After a minute, I looked at the thermometer. "Ah, the temperature rises so slowly! At this time, the water in the beaker did not have any special phenomena. After another minute, I checked the temperature. "20 degrees! "The water in the beaker was normal. After a while, it had been three minutes, the water temperature reached 30 degrees, and the water began to emit white smoke. We recorded it every minute, and the temperature became higher and higher. By the tenth minute , the water temperature reached 74.5 degrees, and the water surface was already bubbling. Finally, at the fifteenth minute, the water temperature was 98 degrees, and the water surface was already rolling. Our experiment was successful! The water is boiling! "The whole group of students shouted, and I laughed happily.

The experiment was over, but the students still had many questions in their hearts. The teacher answered them one by one: What is the boiling point of water? ? 100 degrees; why does our water boil at 98 degrees? That’s because the boiling point of water is 100 degrees at standard atmospheric pressure. The teacher said: " What a bunch of inquisitive guys! "We smiled knowingly.

The flowers have faded, but the fragrance lingers. The experiment is over, but the knowledge left to us will always be remembered in our minds. 7. A composition about scientific experiments (450 (about 2 words)

An interesting experiment

You must have seen "volcanic eruption" on TV, but have you ever seen it with your own eyes? I have seen it once? "Volcanic eruption, but this is a simulation experiment of "volcanic eruption". I also did this experiment myself. Hey, "volcanic eruption" is so fun. You can also contribute

As required by the experiment, I brought a glass, a bottle of vinegar and a bottle of detergent, a pack of baking soda, and a newspaper. First pour some baking soda into the cup, then some detergent, and then put newspaper under the cup.

The experiment was about to begin. I poured some vinegar into the cup, and a miracle soon appeared. Just now, there were only some baking soda and detergent in the bottle. They were safe and sound. Why? How many seconds does it take for it to turn into a bubble? And what was originally just a little bit of foam was now rising rapidly. After only ten seconds, it swarmed up from the mouth of the glass, overflowed the mouth of the bottle and flowed onto the newspaper. At this time, I was excited and surprised. I watched the bubbles floating up intently, for fear of missing any details. After about 18 minutes, the bubbles gradually disappeared again. Ha, this experiment is so fun and interesting!

Why is this? I hurriedly grabbed the book and looked it up, but there was not a single word mentioned in the book, alas! I have no choice but to think about it myself. Didn’t Teacher Liu teach it in class: Baking soda and vinegar will react chemically to produce a large amount of foam, just like soda, which will produce some foam when shaken. So what role does detergent play? I racked my brain and couldn't figure it out.

In order to understand the mystery, I redid this experiment again and found that the reason why the foam increased so much was because the detergent played a catalytic role. Isn't this similar to the formation principle of pumice? This little experiment is really interesting.

Doing small scientific experiments allowed me to understand scientific principles while playing, and it also exercised my ability to use my hands and brain. It was really the best of both worlds. 8. Experimental composition of 400 words

On Saturday, I did an interesting experiment, which was "water in a cup".

I first found a cup and a piece of white paper,

then filled the cup with water,

covered the cup with paper

on top,

and then carefully turn the cup upside down.

Why didn’t the water flow out? Does a piece of paper have that much

power? Dad said:

"Try it with half a cup of water." I really tried it with half a cup, but

the water flowed out all of a sudden. Why is this? Is half a glass of water heavier than a glass of water?

It turns out that

a piece of paper cannot withstand a glass of water,

and what really plays a magical role is the atmospheric pressure,

When the cup is filled with water and covered with paper,

the atmospheric pressure inside the cup is lower than the atmospheric pressure outside the cup,

the atmospheric pressure outside the cup

is higher If the paper is blocked, the water will not flow out. Half a cup of water is lighter than a cup of water, but half a cup of water is still air, so the atmospheric pressure can't help, so the water flows out.

Through this experiment, I learned that I cannot rely on imagination to do anything. I must be well-founded and

be good at observing things through experiments, so as to discover problems and understand the truth. 9. A 500-word essay about experiments in sixth grade

Doing experiments

On Thursday, the science teacher gave us an assignment to go home and do two experiments. The first experiment: dissect the begonia flower or rapeseed flower and observe the petals and stamens. The second experiment is: soak the branches in paint water and see what changes will happen.

On Saturday morning, I picked a complete crabapple flower from the crabapple tree downstairs. I first gently tore open its petals one by one, and saw a five-pointed star-like thing exposed inside, which was dark green, and that was the calyx of the Begonia flower. There is a branch supporting it at the bottom. A long stamen stretches out from the middle of the "five-pointed star", called the pistil, and gathered around it are the stamens.

It’s not that easy to do the second experiment. I first brought a cup and filled it with water. Then, I squeezed some red paint into the cup. The water slowly turned red, and I inserted a branch into it. After a while, I noticed some redness at the roots of the branches and stems. By noon, I saw that a quarter of the branches and stems had turned red. The red color continues to spread upward. I waited for a while and saw that the branches had not changed. I couldn't wait to know the answer. So I ran over and asked my mother: "Mom, what will the branches look like in the end?" My mother smiled and said, "In the end, the leaves on the branches will turn red." I listened with half-belief. But the experiment has not been done yet and no conclusion can be drawn. I had to be patient and wait.

This morning, I saw the edges of the leaves starting to turn red. I knew the experiment was successful! In the afternoon, I found that the veins of the leaves also turned red. It turns out that branches absorb water and nutrients through the conduits in their trunks. Because the water is red, the tubes carry the red color to all parts of the branch, so its leaves are dyed red.