Scientific diary writing

At the end of the day, there must be something worth recording. You might as well sit down and keep a diary. What kind of diary should you read? The following are five scientific diary compositions compiled by me for your reference, hoping to help friends in need.

Last Friday, the science teacher asked us to bring two paper cups, a toothpick and a cotton thread. We are going to do an experiment called: sound microphone.

After class, the students can't wait. The teacher told us to sit quietly, take out the information we brought with us and follow her. First, we fold the toothpick in half, make a small hole in the bottom of two paper cups, and tie one end of cotton thread on the toothpick. The cotton thread comes out of the small hole and is fixed with a toothpick. The other side is fixed in the same way.

After listening, the students all did it by themselves. Finally, the teacher asked us to straighten the line in pairs, one holding a paper cup to talk and the other holding a paper cup to listen. Ah! It worked. Surprisingly, the sound actually travels from the cotton thread to the paper cup. But some students didn't do well in the exam, couldn't hear the sound, and were so anxious that they went to the teacher. The teacher said the hole was too big, and the teacher said to stick the big one on. Sure enough, they made the microphone again. After the lecture, the students are discussing who has the loudest voice and why. One is here and the other is there. This voice transmitter, I think it may be the originator of the telephone!

After seeing the microphone I made, the teacher praised me and said that I did a good job. Today's class is really interesting!

In a science class, we had a competition, which I can't forget, and that was the ice melting competition.

Before class, the teacher took out four ice cubes of the same size and put them in four plastic cups. There are crystal clear ice cubes in the transparent cup. At that time, the students were very curious, and my curiosity was hung up. Some students went to ask the teacher one after another. The teacher said, "We will have a game later, divided into four groups. You can find some ways to melt ice, but you can't take it out or put your hand in it. " Which group of ice melts first wins. "Many people in our group get together, blow together and wrap ice with their hands. I found that only two people in the third group were blowing, and everyone else was shouting "Come on! Come on! ".In the end, all the ice in our group turned into water first, and the ice disappeared.

I summed up the reasons, which are as follows: human body temperature is around 37 degrees Celsius, and the temperature of ice is below zero degrees Celsius. Some of us will be surrounded by high temperature, and then we will transfer the heat to the ice by blowing, so the ice melts.

Science Diary Composition 3 Week X, xx, xx, XX, XX

My family has a backyard, and I often go to the backyard to observe the elves on the herons and green ants.

There are four kinds of ants: red ants, black ants, white ants and yellow ants. Red ants are the most industrious. They line up neatly every morning to look for food. Black ants are experts in combat. Sometimes they bully weak red ants and yellow ants.

I saw black ants invading the base camp of red ants this morning. Many red ants were bitten and scattered in the east and west. That's a real pity. I was very angry and killed all the black ants.

Termites are the worst ants. They often eat wood. Once I helped my father move wood and saw red ants, yellow ants and black ants rushing into the termite's base camp together, beating the termites out of the water. This time, I can raise my hand happily.

Ah! Ants are really fun.

With the rapid development of modern science and technology, the Internet is a symbol. I am not good at talking in life, but I found my own world online. Maybe there is only one veil between illusion and reality.

20xx March 12 Sunday sunny.

There is still one day to celebrate 18' s birthday, and I am really happy to think that I am one year older. So, on a whim, I went online to have a look.

At this time, it is morning time, and the liveliness on the Internet is not directly proportional to the temperature outside the house. I logged into a chat room with the English name "Max" and went to the teahouse. People come and go here, and I have no choice but to squat in a corner and listen to them.

I don't know how long it took, but someone came to talk to me: "Hello, why don't you talk?" I listened, paused for a second, adjusted for a second and answered for five seconds. Then, a word appeared on the screen: "OK!" I immediately realized that something was wrong and forgot to say the word "you" in my panic. She obviously realized this and said to me, "Don't be nervous. I'm not a virgin in the midnight bell. Come out of the computer and eat you. " I had to agree, "Yes, yes." "How do you use Max as your English name?" She began to ask questions. I hit the keyboard hard: "because it represents the highest level, it sounds good." She was very satisfied: "Not bad!" Then she went on to say, "This is my first time surfing the Internet. Knowing you is our fate. Let's be friends! " I was in a good mood and readily agreed. We exchanged e-mail addresses and prepared to communicate in the virtual world. Her screen name is very cute-Wanmei.

Wednesday, April 20xx 12 is sunny.

Today is Wednesday. According to the constellation, today is my lucky day.

Through a month's contact, I learned that she is a student like me. I am a sophomore, and she is one year younger than me. In that case, it is also appropriate to call Wan Mei. Thinking of this, I looked it up on the Internet and found that there was another new email on April 9th, which was sent by Wan Mei. The theme is actually: I want to talk to you. I was really confused at that time, but I opened the email and looked at it, which was both surprised and happy. She wrote: "It's been a month, but I still don't know its name. I want to hear your voice. Find me online this Saturday! " My web pager is 6 10 1852. You must listen! It's now or never! "Oh, what a good chance! How can you lose it! Go through fire and water!

It seems that the lucky day really brought me good luck. I can have a good sleep and a sweet dream tonight, huh? ...

Science Diary Composition 5 This evening, Teacher Liu did a small experiment.

The teacher took out two plastic cups and asked Xia to fill them with tap water. The teacher put the plastic cup filled with water on the table and took out an egg from the plastic bag. He asked us to guess whether the egg would float or sink if we put it in tap water. I thought to myself: If we are doing an experiment, it will definitely give us a surprise. Oh, I know, I think eggs are floating.

The teacher put the egg in the water and it sank. Alas, I guessed wrong.

The teacher took out a bag of salt from the bag, poured it into a plastic cup, then took out a chopstick and stirred it in the water. The water in the cup turned milky white, and the teacher put the egg in the cup again. Wow! This time it's really amazing that eggs can float on the water. The teacher asked us to gently press the egg down, then let go and the egg floated again. It's really interesting.

The teacher told us a story. The story is about a long time ago, a general passed the Dead Sea with some prisoners. The general ordered the prisoners to be thrown into the dead sea. Because there was a lot of salt in the Dead Sea, the prisoners floated up. The general thinks that the gods will not let the prisoners die. The general ordered the prisoner to be fished out and released. In fact, the general doesn't know that people can't sink because of the high salt content in the Dead Sea.

In today's composition class, I learned that fresh water has little buoyancy and salt water has great buoyancy. There are many examples of buoyancy, for example, a ship can float on the water.

;