Poem stories and jokes about expansion with heat and contraction with cold.

1. The teacher asked the students to give an example of thermal expansion and contraction due to cold in life. Xiao Ming raised his hand and replied, "The summer vacation is long and the winter vacation is short."

2. "Heat can make many things expand," said a physics teacher. Can any of you give a few more examples? ""I'll do it, teacher! " A boy in the class immediately stood up and said, "The days in summer are much longer than those in winter. "

3.

Today, in science class, we learned that heat expands and cold contracts. I was inspired to write this short story about heat expanding and cold contracting:

A girl in primary school keeps a pig and a dog. The pig is very proud. If he knows a little knowledge, he will brag wildly, but the dog is very modest, although he knows a lot of knowledge.

The pig heard what the master learned in the later science class: "heat expands and cold contracts." . . . . . "The pig wrote this sentence,

He praised the dog for being a little angry and asked the pig, "Do you know why the days are long in summer and short in winter?" Pigs are stupid now. After some thinking, it suddenly remembered that the heat expanded and the cold contracted, and casually said, "This question is too naive. In fact, it is hot in summer and rises during the day; The weather is cold in winter and the days are shorter. " The dog smiled and said, "This is because the sun is in the Tropic of Cancer in summer, the Tropic of Cancer in winter and the equator in spring and summer."

Since then, the pig has never boasted about himself. Its change makes many animals willing to play with it.

4.

The kindergarten asked Liu Tian to take his temperature every day. Liu Tian asked me to tell him the story of Mercury. I told it the truth that heat expands and contracts. One day, Liu Tian asked me to tell the story of heat expansion and cold contraction. I just want to tell him something about basic physics to make up for the deficiency of "Tao can be said, but not surprising" in the tradition of Chinese studies. Tell him, what is the smallest, breaks in two, and then breaks in two, until it can't be broken any more? Let's call it an atom Just like he played with steel balls.

Atoms are always in motion. I showed him a steel ball. The temperature is very high. In fact, the ball moves very fast. Low temperature means that the ball moves slowly. It seems that it expands with heat and contracts with cold.

Touching something with high temperature feels very hot, but in fact, the ball is hit in the hand and it hurts.

With the atomic basis, many problems are better explained than Yin-Yang and Five Elements. Once, Liu Tian asked me to tell a story about electricity, so I told him. In fact, the atom is not a simple ball, and it can be subdivided. There are some small balls called electrons that revolve around atoms. Just like the solar system, the earth moves around the sun. This electron goes around this atom, around that atom, and along the wire, forming electricity. Liu Tian actually recalled the flash of the moon-exploring satellite he had seen, saying that like a satellite, it revolved around the earth and then around the moon. This metaphor surprised me.

Later, I showed him that oxygen atoms and hydrogen atoms form water molecules like Mickey Mouse's head. Tell him that the difference between solid, liquid and gas lies in whether molecules are pulled like two hand hooks.

We haven't talked about protons and neutrons yet, so we can't estimate the necessity for the time being.

I have read many biographies of scientists before, and they have been influenced by science since childhood. Parents and friends are talking about the frontier of science at the dinner table, and they are also listening.

Personally, this is one of the important reasons why they, and even the whole west, have surpassed us in modern science. They have a good foundation. When our parents and I can only play with sand by the river, they are listening to the frontier of science. As for whether the so-called quality education is the root cause of the gap, I doubt that some people deliberately exaggerate its effectiveness.

I believe that after 30 years, we will be able to make China lead the scientific development for the world again.