1. Why does sorbet get angry?

The reason why sorbet bubbles is because there is a lot of invisible water vapor in the outside air. When it comes to cold sorbet, it will liquefy into droplets when it is cold. It seems that the sorbet is bubbling.

2. Why do sunflowers always face the sun?

Sunflower stems contain a wonderful auxin. This auxin is very afraid of light. When it is illuminated, it will go to the backlight side, and the cells on the backlight side will multiply rapidly. Therefore, the backlit side will grow faster than the bright side, which will bend the sunflower to light.

3. Why do cicadas shed their skin?

Cicada's shell (exoskeleton) is hard and can't expand with the growth of cicada. When the cicada grows to a certain stage, the cicada's exoskeleton restricts its growth, and the cicada loses its original exoskeleton, which is cicada slough.

4. How do bees make honey?

Bees spit the collected sweet flower juice into an empty beehive. At night, they suck sweet juice into their honey stomachs to make it, and then spit it out and swallow it. It takes 65,438+000 ~ 240 times to make sweet honey.

5, hanging on the wall of the quartz clock, when the battery runs out and stops, its second hand often stops at the "9" position on the dial. This is because the second hand is most hindered by the large torque at the "9" position. Scientific common sense

6. Sometimes, when tap water flows from the adjacent faucet, it occasionally makes bursts of noise. This is because the water pipe vibrates when the water rushes out of the tap.

7. When taking pictures on TV, turn off the camera flash and indoor lighting to make the picture clearer. Because the reflected light of the flash lamp and the illuminating lamp on the TV screen will interfere with the transmitted light of the TV picture.

8. At the same temperature, frozen meat thaws faster in water than in air. At the same temperature, hot nails cool faster in water than in air. A cup filled with boiling water cools faster when immersed in water than when immersed in air at the same temperature. All these phenomena show that water has better heat transfer performance than air,

9. When there is cold water in the pot, the water droplets attached to the outer surface of the pot bottom can only be dried up after a long time on the flame, and will only boil when it is dried up. This is because the water droplets, the pot and the water in the pot keep heat conduction, and the temperature is almost the same. As long as the water in the pot is not boiled, the water droplets will not boil, and the water droplets will evaporate on the flame and be gradually dried up.

10, out-of-shape mirror, the farther away from the mirror, the more out of shape. Because the image in the mirror is formed by the reflection of the silver-plated surface behind the mirror, uneven silver-plated surface or uneven glass thickness will lead to aliasing. The farther away from the deformed mirror, the more the reflected light on the silver-plated surface deviates from the normal position according to the principle of light amplification, and the more deformed the mirror is.

2. What little scientific knowledge are there?

1, why do sunflowers always face the sun? Sunflower stems contain a wonderful auxin.

This auxin is very afraid of light. When it is illuminated, it will go to the backlight side, and the cells on the backlight side will multiply rapidly. Therefore, the backlit side will grow faster than the bright side, which will bend the sunflower to light.

2. Why do cicadas shed their skin? Cicada's shell (exoskeleton) is hard and can't expand with the growth of cicada. When the cicada grows to a certain stage, the cicada's exoskeleton restricts its growth, and the cicada loses its original exoskeleton, which is cicada slough. 3. How do bees make honey? Bees spit the collected sweet flower juice into an empty beehive. At night, they suck sweet juice into their honey stomachs to make it, and then spit it out and swallow it. It takes 65,438+000 ~ 240 times, and finally becomes sweet honey. The quartz clock hanging on the wall often stops when the battery is dead.

This is because the second hand is most hindered by the large torque at the "9" position. Popular science tips 5. Sometimes when tap water is discharged from a nearby faucet, there will be occasional noises.

This is because the water pipe vibrates when the water rushes out of the tap. 6. Turn off the camera flash and indoor lighting when shooting TV pictures to make the pictures clearer.

Because the reflected light of flashlight and floodlight on TV screen will interfere with the transmitted light of TV picture. At the same temperature, frozen meat thaws faster in water than in air. At the same temperature, hot nails cool faster in water than in air.

A cup filled with boiling water cools faster when immersed in water than when immersed in air at the same temperature. All these phenomena show that water has better heat transfer than air. 8. When there is cold water in the pot, the water droplets attached to the outer surface of the pot bottom can only be dried on the flame for a long time, and then they will boil. This is because the water droplets, the pot and the water in the pot keep heat conduction, and the temperature is similar. As long as the water in the pot is not boiled, the water droplets will not boil, but will evaporate on the flame and gradually dry up.

3. Scientific knowledge in life plus explanation

1. Cooking is a physical phenomenon that hot steam gas becomes smaller when it is cold. Unlike smoke, it is a burning solid and belongs to the imagination of chemical reaction.

Frogs blink when swallowing because they have no teeth and can only swallow the whole food. There are no bones at the bottom of their eyes, and there is only a thin film between their eyeballs and their mouths. When swallowing food, the frog's eye muscles contract and blink. At the same time, the eyeball protrudes to the mouth, forming a pressure to push food into the esophagus. So frogs often blink when swallowing food.

The phenomenon that the hands of the clock easily stop when there is no electricity is because of the quartz clock hanging on the wall. When the battery runs out and stops, its second hand often stops at the position of "9" on the dial. This is because the second hand is most hindered by the large torque at the "9" position.

Sometimes, when tap water is discharged from the adjacent faucet, the water pipe will vibrate when the water rushes out from the faucet, so there will be occasional noise.

5. When shooting a TV screen, the camera flash and indoor lighting should be turned off to make the picture clearer, because the reflected light of the flash and lighting on the TV screen will interfere with the transmitted light of the TV screen.

6. Frozen meat thaws faster in water than in air at the same temperature, because water has better heat transfer and larger specific heat capacity, that is, water absorbs more heat per unit volume at the same temperature.

7. When the pot is filled with cold water, the water droplets attached to the outer surface of the bottom of the pot can only be boiled on the flame for a long time, and will not boil until it is boiled. This is because the water droplets, the pot and the water in the pot keep heat conduction, and the temperature is almost the same. As long as the water in the pot is not boiled, the water droplets will not boil, but will gradually boil on the flame.

8. Deformed mirrors, the farther people are away from the mirror, the more deformed the phenomenon is. This is because the image in the mirror is reflected by the silver-plated surface behind the mirror, and uneven silver-plated surface or uneven glass thickness will lead to deformation. The farther away from the deformed mirror, the more the reflected light on the silver-plated surface deviates from the normal position according to the principle of light amplification, and the more deformed the mirror is.

9. There are several small holes communicating with the outside world on the side of the gas nozzle of the natural gas furnace, but natural gas will not be ejected from the side holes, but only from the nozzle. This phenomenon is because the gas velocity at the nozzle is high. According to the principle of fluid mechanics, the gas velocity is high and the pressure is low, and the surface pressure of the gas flow is less than the atmospheric pressure outside the side hole, so the natural gas will not be ejected from the side hole of the nozzle.

10, after the balloon is blown up, hold the mouthpiece with your hand, and then suddenly let go, the airflow in the balloon is ejected, and the balloon moves due to recoil. It can be seen that the route of balloon movement is tortuous and changeable for two reasons: first, the inflated balloon is uneven in thickness and full of tension, which makes the balloon contract unevenly when deflated, sway everywhere and change its movement direction constantly; Second, the shape of the balloon is constantly changing during the contraction, so the air velocity on the surface of the balloon is also constantly changing during the movement. According to the principle of fluid mechanics, the air pressure on the surface of the balloon is constantly changing, so the balloon swings and the direction of movement is also constantly changing.

165438+

12, electric furnace "combustion" is the conversion of electric energy into internal energy, without oxygen, it can only oxidize electric furnace wires, shortening service life.

13, thin pieces of paper fall from a height. Even if there is no wind, the path of paper falling is tortuous. This is because each part of the paper has different convexity and concavity and shape, so in the process of falling, the air speed on its surface is different. According to the principle of fluid mechanics, there is uneven air force everywhere on the paper, which changes with the movement of the paper, so the paper keeps rolling and falling zigzag.

14. The phenomenon that scalded nails cool faster in water at the same temperature than in air is because water has better heat transfer and larger specific heat capacity, that is, water per unit volume absorbs more heat at the same temperature.

15 The phenomenon that a cup filled with boiling water cools faster when immersed in water than in air at the same temperature is because water has better heat transfer and larger specific heat capacity than air, that is, water per unit volume absorbs more heat at the same temperature.

16, why can snakes crawl without feet? The reason is that snakes are covered with two kinds of scales. One is in the center of the stomach, the larger one is called abdominal scale, and the smaller scales on both sides and back are called body scale. Abdominal scales play an important role. They are connected by ribs. The ribs can move back and forth freely. When a snake climbs, the costal muscles contract, causing the ribs to move forward, and the abdominal scales connected with them will tilt up a little, so that the tilted scales will step on the ground or feet and push the body forward.

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Ask me if I need it after the answer. I hope you are satisfied. good luck

4. 50 little scientific knowledge around you

The science around you

As long as you pay attention, science is everywhere.

On Saturday, the teacher assigned an assignment to do a scientific experiment. I thought about it and finally came up with an experiment. I want to do a scientific experiment that eggs will float.

Prepare a cup, an egg and some salt. Put water, eggs and salt in the cup first. It's strange that the egg didn't float at this time. As soon as I thought about it, I added salt to the cup in spoonfuls. After adding a few spoonfuls, I found that the eggs began to float slowly. Gradually, the eggs rose to the surface like an elevator.

Why do eggs float from salt water? Because after adding salt to the water, the density of salt water becomes larger, and the buoyancy is greater when the density is larger, and the eggs can be held up when the buoyancy is greater.

This scientific experiment is really interesting. I'll try again.

Chapter 2: Science around us

One night, my mother bought a bag of shrimp. The shrimp is blue, but the cooked shrimp turns red. I asked my mother. My mother didn't tell me the answer directly, but gave me a book, Question and Answer, to find the answer by myself.

I looked for it and finally found it, because there is a pigment called astaxanthin in shrimp. Usually mixed with other pigments, it can't show its bright red color, but after heating, all other pigments are destroyed and decomposed, except astaxanthin, which is not afraid of high temperature, so shrimp turns red after cooking.

It turns out that there is science everywhere in life!

Chapter 3: Science around us

Speaking of science, in fact, many things that happen around us are solved by science. Let me give you a simple example.

I remember once, my mother asked me to open the vinegar bottle when I was cooking, but I just couldn't unscrew it.

Later, my mother told me that it was easy to unscrew the vinegar bottle by soaking it in hot water for five minutes and then washing it with cold water. In this way, I tried to do it in my mother's way. Sure enough, the vinegar bottle was easily unscrewed. My mother told me that this is the effect of heat expansion and cold contraction.

After this incident, I sincerely thank science, which makes me progress and helps me grow.

5. Who knows the most unpopular scientific paper?

Science composition model essay 1: Why is the trunk round? In the process of observing nature, I happened to find that the shape of the trunk is almost round-an empty cone.

Why is the trunk conical? What are the benefits of a conical trunk? In order to discuss these problems, I made more in-depth observation and analysis. With the help of my tutor, I consulted relevant materials and learned that the stems of plants have the functions of supporting plants and transporting water and other nutrients.

The stems of trees are mainly composed of vascular bundles. The supporting function of stem is mainly borne by wood fibers in xylem. Although the stems of woody plants will become thicker year by year, in a certain time range, the number of woody fibers in the stems is certain, that is, the cross-sectional area of the stems is certain.

Then, based on the assumption that the cross section of the trunk grows into different shapes, we design experiments to explore the reasons and advantages of conical trunk. Through experiments, we find that when the cross-sectional area and length of (1) are fixed, the vertical supporting force of triangular columnar objects is the largest and the lateral bearing capacity is the smallest; The vertical supporting force of cylindrical objects is not as good as that of triangular cylindrical objects, but the lateral bearing force is the largest; (2) For trunks with the same mass and different shapes, the short conical trunk bears the largest wind force; (3) Wind is a natural phenomenon, which affects the cross-sectional shape and height of trees.

The approximate cone-shaped trunk has a low center of gravity, and the huge root system is connected with the earth, so the center of gravity drops lower and the stability is greater; (4) The cross section of the trunk is round, which can reduce the damage, has stronger mechanical strength and can resist the wind attack. At the same time, under the action of the wind, the bending degree of the trunk is similar everywhere. No matter which direction the wind blows, the resistance of the trunk is similar, and the trunk is not easy to be damaged.

The above experiments reflect the laws of nature, and nature enlightens us: (1) A columnar object with a triangular cross section has the greatest vertical supporting force, and its shape can be used in buildings, such as angle steel; (2) A circular object with a circular cross section has the largest lateral bearing capacity, and similar building materials can be found everywhere, such as TV towers and telephone poles. In the process of observation, experiment and analysis, I gradually explained and revealed the mystery of conical trunk, increased my knowledge, and combined my knowledge with practice, which not only consolidated my knowledge, but also improved my interest in learning, and initially learned the scientific observation and analysis methods.

Fan Wen 2: Why do leather shoes shine brighter and brighter? Every Sunday, I always finish the task of shoeshine given to me by my mother. Tell you, this is the source of my pocket money for a week! After getting the leather shoes covered with dust, I first wipe off the dust on the vamp, then apply shoe polish and wipe them carefully, and the leather shoes will become bright and beautiful.

But why is this? I found two pairs of old and new leather shoes of the same brand and style for comparative observation. I first touched the uppers of two pairs of leather shoes and found that the surface of the new shoes was much smoother than the old ones.

Old leather shoes are coated with shoe polish. After careful polishing, it shines a lot, but it is still not as good as new leather shoes. Is there a relationship between the brightness of leather shoes and the smoothness of uppers? I brought a pair of old leather shoes that were not polished, and the uppers were uneven under the magnifying glass.

Then, I circled two rough areas A and B on the leather shoes. Carefully wipe area A with shoe polish, and area B without shoe polish as a blank control. I found that the surface of area A is obviously smoother after wiping, and it is more shiny than area B when placed in the sun.

Why is there such a big difference between them? I think the teacher once said in physics class that the wall of the theater is uneven, so that most of the sound can be absorbed and the audience will not be disturbed by the echo. Similarly, light will be reflected on the surface of any object. If the plane is uneven, light will scatter in all directions. If this plane is smooth, then we can see the reflected light in a certain direction.

The surface of leather shoes is not absolutely smooth. If it is an old leather shoe, its surface is of course more uneven and can't reflect light in a certain direction, so it looks dull. There are some small particles in shoe polish, which can just be filled into the pits on the surface of leather shoes when shining shoes.

If you wipe it with a cloth again, the shoe polish will be more uniform, the surface of leather shoes will become smooth and flat, and the reflective ability will be strengthened. Through the experiment, I finally know the secret of shoes getting brighter and brighter! Model essay 3: What effect does vinegar have on flowers? Vinegar is a common condiment in life, while flowers can purify the ecological environment and beautify our life.

Have you ever thought about the relationship between vinegar and flowers? We explored the subject with curiosity. According to people who have rich experience in planting flowers, applying some vinegar on potted flowers can improve the growth of potted flowers and increase flowers, which are bright and leafy.

We soon confirmed this in the experiment. Do different concentrations of vinegar have different effects on flowers? This is the second stage of our experiment.

We select four pots of gypsophila paniculata, primrose and Chinese rose with the same growth and divide them into four groups. Each group (three pots) has three kinds of flowers, which are numbered and labeled respectively. At the same time, we prepared edible white vinegar into three solutions with different concentrations: 1%(pH 2~3), 0.0 1%(pH ≈4) and 0.000 1%(pH ≈6), and sprayed vinegar on three groups of potted flowers once a day, while the fourth group did not.

Observe and record the growth of flowers every five days. The results of this experiment are as follows: spraying low concentration vinegar (pH ≈6) has no obvious effect on these flowers; The flowers sprayed with moderate concentration of vinegar (pH ≈4) are obviously better than other groups, with more buds, earlier flowering, richer colors and longer flowering period. Spraying high concentration vinegar with pH value of 2-3 will make the flowers wither prematurely.

Through this experiment, we can tell you that spraying vinegar properly when planting flowers can make flowers grow better. But to master the concentration of vinegar, excessive acetic acid will harm flowers.

6. Do you have any unpopular tips to share?

These unpopular tips are the ways to deal with symptoms such as daily diet, washing and pathology.

It is inevitable to encounter some minor problems in life. Although these small problems have little impact on us, they may become big problems when accumulated slowly. Therefore, it is necessary to know these 20 little things in daily life. 20 unpopular tips 1, if you eat spicy food, you will feel spicy to death. Just put a little salt in your mouth, hold it, spit it out and rinse your mouth, and it won't be spicy.

2, yellow teeth, you can chew peanuts in your mouth and brush your teeth for three minutes, which is very effective. 3. If there is a small area of skin injury or burn or scald, apply a little toothpaste to stop bleeding and relieve pain immediately.

4, cut the pepper, if it is spicy, you can try to wash your hands with toothpaste, and the effect is good. Open your mouth slightly when you look up at the eye drops, so that your eyes won't blink.

6. If there is an ulcer in the mouth, stick it on the ulcer with vitamin C, and when it dissolves, the ulcer will basically be fine. 7. Eyes turn into small dust, close your eyes and cough a few times, and the dust will come out by itself.

8. After washing your face, gently rub some fine salt on both sides of your nose with your fingers, and then rinse with water, so that blackheads and acne will be removed and pores will become smaller. 9. I have just been bitten by a mosquito, and it doesn't itch when I apply soap.

10. If the throat and gums are inflamed, cut the watermelon into small pieces at night and eat with salt. Remember that it must be at night, when the symptoms will be relieved and the next day will be fine. 1 1, the hair dryer blows at the label, and when the glue of the label is hot, the label is easily torn off.

12. If you are afraid of wrinkling when traveling with clothes, you can roll up everything. 13, drink vinegar when burping, and get immediate results.

14. Eat something smelly, such as garlic and stinky tofu. Just a few peanuts. 15, treating cough, especially dry cough. Before going to bed at night, fry eggs with pure sesame oil, add more oil, and sleep while it is hot for several days, with obvious effect.

16, MM with long and thick wrists wants to wear a thin bracelet, but can't wear it hard. You should put a plastic bag on your hand and wear a bracelet, which is very easy to wear and won't hurt your hand. Take it off, too. 17, chestnut skin is difficult to peel, peel off the shell first, then put it in the microwave oven, take it out while it is hot and rub it, and the skin will fall off.

18, when arranging flowers, drop a drop of detergent in the water for several days. 19, put the walnut in the pot and steam it for ten minutes, then take it out and put it in cold water to break it, and then take out the whole peach kernel.

20. Put the shrimps in a bowl, add a little salt and edible alkali powder, rub them with your hands for a while, then soak them in clear water, and then rinse them with clear water, which will make the fried shrimps transparent as crystal, refreshing and delicious. Don't underestimate these little knowledge of life, they can often bring us unexpected results.

For example, flour is also common in life, but do you know that flour has unexpected uses? The wonderful use of flour 1, put a spoonful of flour in the water, roll the grapes back and forth in the water, gently knead them, and then sieve them with clear water to remove the dirt on the grape skins. 2. Sprinkle some white flour on the fish before frying it. When the fish is in the pot, the oil will not overflow, the skin of the fish will not be broken, and the fish will be crisp and rotten.

When cooking, I got oil on my hands. You can grab some flour and rub your hands in the water. Can be washed very clean, can remove the smell. 4, wash greasy pots, pots and other kitchen utensils, if you put a small amount of flour in the water, it is easier to wash.

5. Knead the pork liver with flour and leave it for about 1 hour, then wash it with clear water to remove the odor. 6. Add a spoonful of flour to the water for washing black fungus and stir it in one direction several times.

Let it stand for about ten minutes before cleaning, because the flour is sticky and will bring down the sediment on the surface of the fungus, and then rinse it with clear water.