Experiment (1) On Saturday, I did an interesting experiment, that is, "The cup is full of water". I first found a cup and a blank sheet of paper, then filled the cup with water, covered it with paper, and carefully turned the cup upside down. Why doesn't the water come out? Is a piece of paper that powerful? Dad said, "Try it with half a glass of water." I really tried it with half a cup and the water suddenly came out. Why is this? Is half a glass of water heavier than a glass of water? It turns out that a piece of paper can't hold a glass of water. The real magic is atmospheric pressure. When the cup is filled with water and covered with paper, the atmospheric pressure in the cup is lower than that outside the cup, and the atmospheric pressure outside the cup presses the paper, so the water cannot flow out. Half a glass of water is lighter than a glass of water, but half a glass of water is still air, and atmospheric pressure can't help, so water flows out. Through this experiment, I understand that everything depends not on imagination, but on evidence. I should be good at observing things through experiments, so as to find problems and understand the truth. Experiment ② Today, we had a comprehensive practical lesson in our class. After telling us some theoretical knowledge, the teacher said to us, "There are still more than ten minutes before class is over. Let's do an experiment, shall we? " We said loudly with one voice, "Good, great!" The teacher asked a classmate to bring experimental instruments, two cups, a lighter and an alcohol lamp. After the utensils were brought, the teacher began to do the experiment. We all watched quietly. The name of this experiment is "the bottle eats the egg". Start doing experiments. The teacher praised the lighting of the alcohol lamp, then put a bottle on it and let the alcohol lamp burn to the bottom of the bottle. There is an egg on the bottle mouth. Because the bottle mouth is relatively small, the egg did not fall, but was placed on the bottle mouth. After a while, hot air came out of the bottle. After burning for a while, the heat disappeared. I think according to the book, this egg should have fallen into the bottle by now. However, the egg still lives motionless on the bottle mouth. It seems to be laughing at our inability to put it in a bottle. After cooking for a while, the egg still sits firmly on the bottle mouth. At this time, the teacher said, "It seems that the mouth of this bottle is too small, so the experiment was not successful." Now, let's change a bottle with a bigger mouth and do this experiment again. "We waited patiently. The teacher went to find a bottle that was bigger than the opening just now, and the egg wouldn't fall into it immediately. Now I'm burning bottles with alcohol lamps. This time, it was great. Shortly after the bottle was heated, it seemed that the egg on the bottle mouth was no longer Jiang Taigong, but fell into the bottle. Ah, the experiment succeeded! The bottle really ate the egg! The teacher still wants us to discuss the reason, but the bell has finished. So, the old teacher said, let's find a few people to discuss after class, and then communicate next class to find out why. Today, the experiment of eating eggs in a bottle finally succeeded, and I feel very happy! Experiment 3 Today, when I came to my father's office panting, my father took out a lot of strange things and said to me, "Li Jian, do you want me to give you an interesting experiment?" I said, "Good! But what do you use to do it? " Dad pointed to the pile in his hand and said, "That's it!" " "I said," huh? No way! How is that possible? What experiment are you going to do? "The experiment of eating fire said with a sly smile on my father's face. I saw my father fiddling with the experimental tools. Then, he took out a bottle full of alcohol and a peeled Sydney and soaked it in alcohol. Then he picked up a candle and lit it with fire. Then, he took out the Sydney soaked in alcohol and lit it with a candle. Then, the important moment came, and a miracle happened! Dad swallowed the burning Sydney! ! I let out a cry, "wow! Dad, are you going to die? Aren't you scared? Oh, my God! You must not have an accident! I thought with prayer and impatience. " A few minutes later, it was amazing! Dad is fine. He chews happily and says it's delicious. How strange! I asked my father, "Dad, aren't you afraid?" Have you developed a mouth that is not afraid of fire? "I said in surprise. Dad told me, "It's nothing, as long as you keep your mouth shut and don't breathe when you put the pear in your mouth." How's it going? Would you like to have a try? " 。" I said, "Good!" Dad repeated the action just now, and then brought me the burning Sydney and said, "Wait a minute, eat when I tell you to eat, and chew when I tell you to chew, remember!" " I looked at Sydney, which was still burning, and said in fear, "All right." So, I took Sydney and ate it. My father ordered me to put it in my mouth at once. After a few minutes, my father said, "Chew." So, I started eating, ah! It is really delicious! And I don't feel any pain at all. I thought it was really strange, so I asked my father. Father said, "Everyone knows that fire depends on air, because when we eat it, we immediately shut up and stop breathing. At this time, there is no air in our mouth, and the fire will naturally go out, and it will be fine! " Ah! It turns out that there are such wonderful experiments in the world. The peach blossoms are withered, but there is still time to bloom. The swallow has flown away, and there is still time to come again; Time has passed, but it can't be redeemed. "Don't wait, youth is white and sad." This is Yue Fei's famous saying, warning us to cherish time and not to waste it. "An inch of time is worth an inch of gold, but an inch of gold can't buy an inch of time." Indeed, time is priceless, even if you spend more money to buy time, you can't buy it. "Time flies, the sun and the moon fly", time is fair, it gives everyone 24 hours a day, depending on whether you can race against time and run ahead of time to be the little master of time. "Time is like water in a river, it can only flow away, and it can't go backwards." Yes, time is ruthless. It will only run forward and never go backwards. Whether you use or waste this time, it won't make up for it, even for a minute. Smart people cherish time, stupid people waste time. Some people know that time is life and time is money. Lu Xun, a great revolutionary and writer in China, is a typical example. Lu Xun went to the barber shop for a haircut. The barber knows Lu Xun. When he cut Lu Xun's hair, he cut it beautifully. Of course, it takes more time. A haircut cost one yuan. When paying, Lu Xun only paid fifty cents. The barber is confused. Lu Xun's reason is: wasting my time. Lu Xun can haggle over every ounce for a little time, but can't we? Edison, a world-famous inventor, likes doing experiments very much. He used his spare time selling newspapers on the train to do experiments. In the process of inventing the electric light, he worked day and night. You know, a person's life is only a short moment in the long river of history, and no one wants to leave glory in the long river of history. Then, we should seize precious time to create a valuable life. Helen Keller put it well: Treat every day of your life as if it were your last. And some people only know how to kill time. As the saying goes, what can be done today has not been finished today. But now some students only know how to play, leaving their studies behind. Of course, they also have their own famous saying: anyway, there is plenty of time, and it is not too late to do it tomorrow. "Tomorrow and the day after tomorrow, tomorrow. I will live tomorrow, and everything will be in vain. " How many tomorrows does a person have in his life? "Don't be idle, grow old together, and be sad." . Yes! "Young people don't work hard, and the boss is sad." Tomorrow, tomorrow becomes today, and after every today, there are countless tomorrows. So, when will your promise come true? My friend, you know, we should cherish every day of our lives, and the value of life is reflected in every minute. Time is money. My friend, seize today, you will be worthy of yesterday, and you will have the confidence to meet a brilliant tomorrow. May we cherish every minute of life and create a valuable life. You can spend an inch of time and an inch of gold, and an inch of gold can't buy an inch of time or a young man who doesn't work hard. If the boss forces a smile, he can't wait, and the young man's head will be white and empty. Tomorrow after tomorrow, there are so many tomorrows. Tomorrow will never come. Experiment 5 "Ouch!" I turned off the computer and came out. I found some sponges and boxes on the dining table. Mom came out and said, "Let's do this little experiment with these things today!" " I looked at the sponge and the box and asked, "Can you do this little experiment with four sponges and two boxes?" ""If not, do it first, and try not to break the egg! " Mom replied. This is a small experiment arranged by our teacher. We dropped the egg from the fourth floor, trying to prevent it from breaking. I thought, what should I do with these things? Do you wrap eggs in a sponge and throw them away? Or put the eggs in the box and throw them down? Or do you wrap the eggs in a sponge and throw them in a box? This question is difficult for me to answer. I gestured on the table with my hands and thought in my head. Suddenly, I had a good idea-first wrap the eggs with the biggest sponge, then put a sponge at the bottom of the bubble gum box, then put the sponge wrapped with eggs in the bubble gum box, then put a sponge at the bottom of the metronome box, then put the bubble gum box in, and finally put a sponge on it. I thought of a good idea and I started to act at once. After I finished, I thought to myself, I'm sure I can do it this time So my mother and I came to the fourth floor. I'll look at the position first and then vote. I saw it bounce on the branch, then bounce on the hedge and fall. I hurried downstairs, picked up the plastic bag, and thought, it won't rot this time. So he ran upstairs and asked his mother, "Do you think it's rotten?" Mother replied, "I think it should be intact!" """So that's what you think!" I went on to say. When I got home, I couldn't wait to open the box and found that the egg was still a ball and felt cold. Mom also ran back to the kitchen and panted, "What about the eggs? Is it broken? " I was ecstatic and told her: "intact!" Mother's face suddenly showed a satisfied smile. In order to challenge my intelligence, I decided to compete again. Pack it as before for the first time, and then throw it from the sixth floor. I thought, don't break it this time! Otherwise, my hopes will be dashed. But when I opened the outside, I saw a whole egg, which was still cold. I succeeded again this time. The second time is not as simple as you think, you have to throw it from the seventh floor and a half. This time, I brought the equipment closer. At the destination, I threw it down and asked my mother, "Do you think it is broken?" "I think it is broken!" I have a feeling of fear in my heart. But what you hear is false, what you see is true! I picked up the egg and opened it. Wow! I cheered with joy. From this experiment, I know that I must concentrate on one thing to succeed.