I believe that many people have had the experience of writing essays and are familiar with them, especially expository essays, which are one of the main types of essays to learn. The characteristic of expository essays is "telling" and a certain amount of knowledge. sex. So how should the explanatory text be written appropriately? The following is an explanatory text that I carefully compiled to introduce the refrigerator for your reference. I hope it can help friends in need. Explanatory text introducing the refrigerator 1

Jacoby Perkins, an American working in England, made a new discovery, which led to the invention of the refrigerator. In 1834 he discovered that when certain liquids evaporate, there is a cooling effect. Perkins asked a team of mechanics to create a working model that would prove the idea.

Sure enough, this device actually produced some ice one night. The technicians excitedly jumped into a carriage with ice in hand and sped to Perkins' house to show him what they had achieved. Perkins was now elderly, and although he did not market his invention, Harrison's work paved the way for early-style home refrigerators.

The life of a man who sold inventions was a Scottish printer in Australia - John Harrison. It is possible that Harrison discovered the cooling effect without knowing Perkins' results. He used ether to clean metal printing type and one day noticed the cooling effect of the substance. By 1862, his first refrigerators were on the market. Harrison also set up the first refrigeration workshop at a brewery in Bendigo, Victoria. At the end of the 19th century, only wealthy people who built icehouses could enjoy this benefit. What most people want is just a refrigerator.

At that time, one of the most important uses of refrigerators was on ships. Large cold storage means ships can carry fresh meat on long voyages, such as lamb from New Zealand to Europe.

German engineer Carl von Linde built the first household refrigerator in 1879. But before the invention of the electric refrigerator in the 1920s, refrigerators did not enter households on a large scale.

Next, let me introduce you to the relevant knowledge of refrigerators!

Principle of refrigerator: Refrigerator uses evaporation to cool or gasification to absorb heat to achieve the purpose of cooling. The pipes of the refrigerator contain a refrigerant commercially known as Freon, commonly known as refrigerant. The commonly used one is difluorodichloromethane (CCL2F2), which is a colorless, odorless and non-toxic gas with a boiling point of 29°C. When Freon is in the gas state, it is pressurized by the compressor. After pressurization, it flows through the pipe to the condenser on the back of the refrigerator, where it is dissipated by the heat sink (the temperature will increase after the material is compressed), and then condenses into a liquid. After the liquid Freon enters the evaporator valve, it immediately turns into steam due to breaking away from the pressure of the compressor. At the same time, it absorbs the latent heat of vaporization from the air and food in the refrigerator, causing the interior of the refrigerator to cool. The vaporized Freon is forced back to the condenser outside the box by the compressor to dissipate heat, and then becomes a liquid. This cycle continues, pumping the heat energy in the refrigerator to the outside of the box.

The role of the refrigerator: Since food is prone to deterioration at higher temperatures, in order to extend the storage time of food, food is placed in a lower temperature environment to slow down the rate of food deterioration. The refrigerator uses a vapor compression refrigeration device for refrigeration, so that the internal temperature is lower than the ambient temperature to store food.

The appearance and structure of the refrigerator: It is mainly divided into a refrigerator compartment and a freezer compartment. The temperature of the cold room is between 0-5 degrees and is used to store vegetables, etc. The temperature of the freezer is below -16 degrees for storing meat, etc.

System structure of refrigerator: The refrigerator is composed of four basic parts: evaporator, compressor, condenser, and capillary tube.

The refrigeration principle of the refrigerator: after being throttled and decompressed by the capillary tube, the refrigerant quickly evaporates and absorbs heat inside the evaporator, absorbs the heat inside the refrigerator and freezer, and enters the refrigerator under the action of the compressor. The condenser releases heat to the outside world and condenses it into a supercooled liquid, which again passes through the capillary throttling and pressure reduction, and this cycle is used for refrigeration.

Nowadays, there are many inventions similar to refrigerators, most of which have brought convenience to people. We should thank their inventors, because they have paid far more than we can imagine! Explanatory text 2 introducing the refrigerator

Speaking of the refrigerator, it is an indispensable part of every household. Without it, there is no guarantee that your meals will be fresh.

With the progress of mankind, the functions of our refrigerators are constantly increasing. Let me introduce to you all the functions of our refrigerators.

My refrigerator is from Siemens, with a rectangular body and a silver-gray coat, guarding our kitchen like a warrior. The refrigerator is mainly divided into three layers. The first layer is mainly used for refrigeration. The interior has tempered glass divided into layers of grids for storing leftovers, eggs, milk and some drinks. The second layer is mainly used for biological preservation. This biological preservation is a unique technology of Siemens refrigerators. It can keep the food at 0 degrees Celsius and inhibit some viruses, thereby keeping the food fresh longer. In the past, vegetables and fruits in the refrigerator could only be After being stored for a week, it will dry up due to water loss. But now with this biological preservation function, our vegetables and fruits are still watery and fresh after being stored for half a month! This is something that other refrigerators cannot do.

The third layer is mainly used for freezing. You can put some chicken, duck, fish, delicious ice cream, and chocolate here and taste them slowly. In addition to these, our refrigerator door also has a control panel that can control three temperatures, as well as energy saving, holiday, automatic, and locking functions.

I remember one time, I was going out to play with my mother for a few days, but there was a lot of fish and meat in the refrigerator. I suggested throwing away the meat, while my mother smiled and adjusted the refrigerator system to the holiday function. This function only works in the freezer and does not work in other places. It saves power and can freeze. After I came back, the fish was really not bad. I have to admire the wisdom of mankind.

However, no refrigerator is without defects, and my refrigerator is no exception. I remember one time when I went back to my hometown, my mother said that it would be unsafe to turn off the power, but she forgot to take out a piece of meat. There were a lot of bugs, and the shelf couldn't be taken down, and it couldn't be flushed with water, so I had to wipe it off bit by bit as the master said. It took my mother a few days to clean it up, and then used tea to remove the odor. It took almost half a month to use the refrigerator.

I really hope that the next generation of refrigerators can solve these problems. Explanatory text introducing the refrigerator 3

Recently, a new guest moved into my living room. He was wearing a crisp white suit. He was tall and tall, standing in the corner of my living room like a strong man. It seems to be protecting the peace of my home. My refrigerator is about 1.8 meters tall. He is divided into left and right sides. The one on the left is frozen, the one on the right is refrigerated.

I opened the left door of the refrigerator and felt a blast of cold air. Turns out I turned on the freezer. It is divided into many small grids, where there are many kinds of food that I like to eat. There are many kinds of meat on the first layer, seafood on the second layer, and chicken and duck on the third layer. There are also various kinds of ice cream in the drawer, among which "cute" is my favorite. Whenever the summer is hot, I take out a "Kaiduo" to eat, and the ice-cold feeling is very comfortable! My mother often puts a small portion of meat or seafood on the door. After a long time, I develop I had a question: Why put it on the door? My mother asked: "Do you think the LED display on the door shows how cold it is?" "Seventeen degrees below zero," I replied. "And the temperature on the door is only minus four degrees, and it has a defrosting function." It dawned on me.

As the alarm bell rang, I opened the right door of the refrigerator, and a colorful picture came into view. It is made up of many colorful fruits. Red apples, yellow pears, purple grapes, orange oranges, green watermelons... and delicious yogurt. Makes me salivate!

Not only can it store delicious fruits, it also has many powerful functions. For example: there is a special ice-making place, which can make a lot of ice at one time. You know the feeling of adding it to Coke. Refrigeration and freezing temperatures can be changed as the seasons change. It can be defrosted intelligently. According to the actual frequency of use, intelligent defrosting is used to determine the speed of frost formation, which is more conducive to energy saving. The heat insulation is also very good. Supreme heat insulation panels are used in key parts. The refrigerator consumes less energy, preserves freshness better, and has better quality.

There are also power-saving functions, etc...

Refrigerators have become an indispensable part of us. I can imagine how difficult life would be without a refrigerator. The food you buy goes bad in a few days.

Hey, big-bellied brother, you are my favorite. You are my good partner in life, life will be better with your presence. Explanatory text 4 introducing the refrigerator

Everyone has a refrigerator, right? Refrigerator and air conditioner - it doesn't matter, right? But if you ask me to say it, NO!

When I was very young, my small refrigerator "went on strike". Several uncles in uniforms took it to the "hospital", and they brought in a large, square thing. , is twice as tall as me, and his big body is divided into two compartments, "Hmm! Weird thing, this must be our new refrigerator.", I came to the conclusion.

"Hoo! Hoo! Hoo! Hot! Hot! Hot!" One afternoon that summer, I kept shaking my fan, but I was still sweating profusely from the heat. "Hmph! What the hell is the weather? The wind blowing out is stuffy and hot!" I pouted, looking unhappy. There was no way the air conditioner was out of order, and the fan wasn't enough... Wait, I turned my attention to the refrigerator. "Hehe!" I clapped my hands, and a "good idea" popped into my head. "Every time grandma takes out the things inside, they are ice cold, which means-haha, it must be very cool inside!" I happily turned around in a circle, ran over, stood on tiptoes, stretched out my arms, and stretched out my arms with all my strength. The ground pulled it away. Wow...a blast of cold air hits my face! "Wow! It's so comfortable! So cool!" I took a deep breath and leaned in closer. "Oh yeah, it's so cool, so comfortable! So comfortable! This big air conditioner works so well, it's not hot at all!" I clapped my hands excitedly. But as soon as I closed the refrigerator door, the stuffy feeling caught up with me again, "Oh! It's so annoying! It's hot again!" I opened the refrigerator again impatiently, wow! So cool! I twisted around and was intoxicated by the comfort of the "air-conditioning on my face". "Wait a minute," I slapped my forehead, "What should I do if it gets hot again later? Haha, I want to keep the whole family cool!" I think this idea is really great! I just did it, I grabbed the refrigerator door, I fanned it, I fanned it, I fanned it... A cool breeze blew in, and a lot of the heat around me suddenly disappeared! The more I fanned, the harder I fanned, and the cool breeze became stronger and stronger. Just when I was fanning myself and getting carried away, I suddenly felt a cold air that was colder than the refrigerator air coming from behind. "Oh, it's over." I looked back, and sure enough I saw my grandma standing behind me, staring straight at me. "Well... that..." I rubbed my hands, "because... the refrigerator... is very cool... because... the house... is too hot..." I started to make senseless nonsense. "Hahaha! Hahaha..." I made my grandma laugh so hard that she burst into tears, and I just escaped from the disaster in my grandma's laughter.

Hmm...well, a refrigerator is a refrigerator and an air conditioner is an air conditioner. ah! No! Wait, it should be a refrigerator and an air conditioner. Why? Because food is very cool in the refrigerator, the refrigerator is the air conditioner for the food! La la la...I'm very smart! Hahaha... Explanatory text introducing the refrigerator 5

Is this thing rare? One belly holds fruits and vegetables; the other belly holds ice cream, chocolate and other delicious foods... Guess what on earth is this? Smart Have you guessed it? It is an indispensable part of life - the refrigerator!

My refrigerator is "Mr. Haier", but my parents spent thousands of dollars to "invite" it home. What we serve! Its upper floor is the freezer compartment and the lower floor is the refrigerator compartment.

There are many things I like to eat in the freezer: popsicles, chocolate, and ice cream! They are all available! Every day after school, I will grab some chocolate and one or two popsicles and wolf them down. . Oh, by the way! There is another "heavyweight customer" here! Meat products! This is my favorite thing to eat! Put it in it, and when you want to eat it, just take it out and remove the ice, and then you can fry it A delicious dish!

And the refrigerator is the "big contributor" to our family! Without its help, those dishes would go bad.

Once, after dinner, I left and forgot to put the vegetables in the refrigerator. As a result, when I woke up the next day, some of the vegetables had gone bad and sour! It seemed that its effect was too great. Oh!

Students, have you seen those small grids on the inside of the door? I think you must be confused! What are those used for? Let me tell you! That Ah, this is the "hometown" of the egg babies. The eggs you buy must be placed there, otherwise, if you shake them lightly, the baby eggs will be "to pieces"; moreover, placing the baby eggs there will also play a very good role in preserving freshness. It can still be kept for several months! Isn’t it amazing?

By the way, you should know the precautions: 1. Give it a "bath" regularly every month to let its belly The delicious food inside will not be "swallowed" by dust; 2. The temperature of the refrigerator cannot be adjusted too low to prevent the food soup from being frozen into small jelly; 3. Be sure to remember to close the door, otherwise The air conditioner will come out and make noise, and it will also waste electricity.

Oh, after talking for so long, I haven’t introduced its appearance yet! It is very beautiful, with a milky white coat, like an angel in white standing next to the wall. It is over 1.7 meters tall, taller than me. It's a whole head taller! Even a little taller than my mother! It has four "legs" (four wheels), so you don't have to worry about trouble when moving. Its big belly also says: China's well-known trademark, low power consumption, high-end, etc. How about it, it should be cool enough!

This is the "little nanny" of my family - the Haier refrigerator, the "big contributor" of our family. Do you think it is good? What about your refrigerator? What is it like? Explanatory text introducing the refrigerator 6

Do you think it is strange or not, it has two big bellies, with fruits and vegetables on top, cold drinks on the bottom, and a white suit. Haha, have you guessed it? By the way, this is the "big hero" of our family - the refrigerator!

My refrigerator is all white, with a pair of Haier brothers in the upper left corner, and the younger brother is holding an ice cream , and the brother raised his thumb, as if praising how good the refrigerator was. I took a fancy to this refrigerator at a glance among the vast crowd of people, and spent thousands of dollars to "invite" it home. The refrigerator is 1.7 meters tall, half a head taller than mine! It is upright, like a big box, standing on the edge of the restaurant.

The upper floor of the refrigerator is the refrigerator compartment. When you open the door of the refrigerator compartment, you will be dazzled by the dazzling array of food inside: vegetables, fruits, chocolate... In summer, this refrigerator compartment can come in handy. Well, one time, my mother forgot to put the leftover food in the refrigerator. As a result, all the food went rancid the next day. I learned a lesson after eating. After that, similar mistakes never happened again. The role of the refrigerator Indispensable contribution. There are small grids behind the refrigerator door. What are these? It turns out to be small grids for placing eggs. If you put the eggs in here, you don’t have to worry about breaking them, and they can also be kept fresh! And the vegetables and fruits placed on each layer can be seen clearly. It's so watery when you go up there, it's really mouth-watering.

The lower level of the refrigerator is the freezer compartment, which stores various frozen foods and ice cream. Every time you open the freezer door, there is a slight chill. When I run home at noon, I will be sweating profusely. At this time, I will open the freezer, take out a few popsicles, or wolf down them, or suck them carefully and slowly before I am willing to do my homework with satisfaction. Of course, in addition to ice cream, there is also a distinguished guest in the refrigerator - meat products, which are never public and lie silently at the bottom. Freeze the meat so that it won't stink or go bad. When you need to use the meat, take it out and put it in water for a while, then you can fry it and eat it.

However, the refrigerator also has shortcomings: it must be "bathed" every month, otherwise it will freeze. Second, do not place the refrigerator against the wall, otherwise the heat dissipation holes will be blocked and the service life will be shortened. Third, the door must be closed tightly, otherwise the air conditioner will sneak out and make noise, which will not waste electricity.

Refrigerators bring us convenience and also mark the brilliant achievements of science and technology. With the improvement of science and technology, maybe one day "refrigerators" will also be "retired"!

< p> I love my refrigerator, and even more its spirit of dedication and obscurity. Explanatory Essay 7 Introducing the Refrigerator

It is late at night, and the whole family has fallen into a sweet dream. Only one thing in my house is still working hard - my refrigerator.

It has been serving my family for five years. Because my mother always maintains the refrigerator very carefully, and with the love and care of our family, she is still so beautiful and touching.

She has a white and moist body. On her face, there are several colorful "false eyelashes" (stickers). Of course, on her mouth, which is bigger than a computer screen, there are various "Lipstick" in different colors - let me tell you secretly, in fact, these decorations are all my masterpieces! Look at her appearance, she can be called the "top supermodel in the refrigerator industry".

There are seven floors in the refrigerator, three floors in the refrigerator, and four floors in the freezer.

Open the door of the refrigerator compartment. Snacks are neatly placed on the first floor, while fruits and vegetables and some leftovers are placed on the second and third floors. After I introduced this, There are so many, I think you will definitely call it a "big eater".

On the door of the refrigerator, several lively and cute little egg babies are lazily sleeping in their own nests, seeming to be waiting for the call of their owners.

Sometimes, I will also put the delicious QQ candy in the refrigerator. When I take it out to eat, it will make you feel chewy. The deliciousness is refreshing and makes you intoxicated. This can be attributed to the refrigerator!

Every summer, I would clamor to my mother to take me to buy popsicles and enjoy the delicious food. Sometimes, the sun is so strong that it can roast a live duck, but I want to go out to play again, what should I do? I open the refrigerator, and a burst of cool air hits me, refreshing. Take out another popsicle and open the paper bag, oh, the ice is cool, sweet and sour, so delicious!

The benefits of the refrigerator are far more than these, it can also keep food fresh for a long time... once , my mother saw that the meat on the street was cheap and fresh, so she bought two whole bags. But my father was not at home at night, so my mother and I were the only ones at home. What should we do if we couldn’t finish eating so much meat? My mother washed the meat, packed it into bags, and put the meat into the refrigerator slowly.

Although the refrigerator has many functions, it has one flaw: it cannot work during a power outage, just like Liang Shanbo's strategist Wu (Wu) Yong. If in the future an inventor can invent a battery to be installed in the refrigerator, then there will be no need to worry about power outages.