1. Why does sorbet bubble?

Sorbet gas because the outside air has a lot of invisible water vapor, encountered a very cold sorbet, a cold liquefied into droplets surrounded by sorbet, it seems to be sorbet in the "gas" as.

2. Why are sunflowers always facing the sun?

The stem of the sunflower contains a wonderful plant growth hormone. This growth hormone is very afraid of light. As soon as the light irradiation, it will go to the backlit side, at the same time it also *** backlit side of the cell rapid reproduction, so the backlit side of the side than the light side of the growth of the fast, so that the sunflower produces a light-focused bending.

3. Why do cicadas molt?

The outer shell (exoskeleton) of a cicada is hard and cannot be expanded as the cicada grows. When the cicada grows to a certain stage, the cicada's exoskeleton restricts the cicada's growth, and the cicada sheds its original exoskeleton, which is the cicada molt.

4. How do bees make honey?

The bee first picks the flowers sweet juice spit into an empty hive, at night, and then suck the sweet juice to their own honey stomach modulation, and then spit it out, and then swallowed, so that by turns swallowed, to be carried out 100 to 240 times, and finally brewed into sweet honey

5, hung on the wall of the quartz clock, when the battery runs out of power and stop walking, its second hand often stop in the dial on the "9" position. This is due to the second hand in the "9" position by the gravity moment of the largest obstruction. Science Knowledge

6, sometimes the water pipe in the neighboring faucet when the water, occasional bursts of sound. This is due to the water from the faucet when rushing out of the water pipe caused by **** vibration.

7, to take pictures of the TV screen, you should turn off the camera flash and indoor lighting, so that the picture taken by the picture is clearer. Because the flash and lighting on the TV screen reflected light will interfere with the transmitted light of the TV screen.

8. Frozen meat thaws faster in water than in air at the same temperature. A burning nail cools faster in water than in air of the same temperature. A cup filled with boiling hot water cools faster when immersed in water than in air at the same temperature. These phenomena show that: the heat transfer of water is better than air,

2. Life science trivia

Pendulum ---- isochronous principle

Fuse ---- too much current leads to more heat to burn off the wire

The valve on the pressure cooker ---- to avoid too much pressure inside the pot, the top of the lid

Steaming steamed buns to put soda ash ---- Soda ash, Na2CO3, heated to generate CO2, so that buns "fat" up

Lightning rod ---- tip of the discharge, the electricity from the clouds into the low, to avoid it hit the building

Stir frying with an iron pot, iron can be dissolved into the dishes, to supplement the human body needs iron

In summer, the ground will be cooler when sprinkled with water. Sprinkle water on the ground in summer will be cooler, because of evaporation cooling

Make the hammer tighter you can take the hammer handle down, which is the use of inertia

The use of thermometers is the use of liquid thermal expansion and contraction

When you hit someone with force, you will also feel the pain because of the force of the role of each other

3. what are the science of life

Life Science Little common sense --------------- Avoid using raw and cold tap water to cook rice Many people are used to using raw and cold tap water to cook rice, in fact, this is not scientific.

Because raw cold tap water contains a certain amount of chlorine, in the process of cooking, it will be a large number of food contained in the destruction of indispensable vitamin B1. It is determined that the use of raw tap water to cook, the loss of vitamin B1 loss of the number of time with the cooking time, cooking temperature is proportional to the general situation, the loss of about 30%.

If you use boiled cooked water to cook rice, vitamin B1 can be free from loss, because after boiling cooked water, chlorine has been evaporated with the water. Don't squeeze the water to make dumpling filling In daily life, people often use cabbage, leeks, celery and pork and mutton to make dumpling filling.

Due to the high water content in vegetables, people used to squeeze the water out of the dumpling filling in order to prevent the dumpling filling from flowing. This practice is not scientific.

Because vegetable water contains a lot of B vitamins and vitamin C, but also contains carotene and minerals needed by the human body. And after squeezing out the soup, the dumplings tasted drier.

So, how can you not squeeze out the water in the lei filling, and not let the dumpling filling flow soup? The method is, first of all, the meat and green onions chopped, plus seasoning mix, and then chopped cabbage, chopped cabbage, do not add salt, chopped cabbage little by little into the meat, while adding the side of the mix, so that the meat can be evenly absorbed in the water in the vegetable fillings, wrapped up in the dumplings will be tasty and appetizing. The first thing you need to do is to take a look at the actual food you're eating, and you'll be able to see what you're eating, and you'll be able to see what you're eating.

After investigation, the incidence of esophageal cancer is related to eating hot food, hot food. The normal temperature of human mouth and esophagus is 36.5~37.2℃, and its heat-resistant temperature is 50~60℃.

If the temperature of food and water is too high, the mucous membrane of the oral cavity and esophageal wall will be scalded. People feel very hot and very hot food, usually at 70 ~ 80 ℃, often eat this kind of food, the mucous membrane of the oral cavity and esophageal wall will continue to be damaged, and constantly proliferation of new cells.

If long-term *** plus sometimes inflammation of the human body lesions, so that the process of cell renewal accelerated, it is likely to become oral cancer and esophageal cancer. Therefore, you should not eat hot food.

Avoid using paint chopsticks Paint chopsticks are beautiful and cheap, but from a health point of view, it is not good for health. This is because.

Paint is a polymer organic compounds, most of which contain toxic chemicals, especially yellow paint, is formulated with yellow pigments containing lead and chromium, lead content accounted for 64% of the total amount of pigments, chromium content also reached 16.1%. Part of the green (by the blue, yellow mixed), brown (by the yellow, red, black color mixed) paint also contains lead, chromium.

When the long-term use of paint chopsticks to eat, especially paint off with the food swallowed into the stomach, lead and chromium and other toxic substances into the human body is accumulated on the risk of chronic poisoning. The amount of lead poisoning is 0.04 grams, and the lethal amount is about 20 grams.

The amount of lead entering the body in each mouth is more than l milligrams, which can cause harm to the human body. Lead mainly damages the nervous system, hematopoietic organs and kidneys, and in severe cases, there can be metal obscurantism in the mouth, lead lines in the gums, and gastrointestinal symptoms, neurasthenia and muscle pain.

Especially affect the intellectual development of children. Therefore, in daily life, it is best not to use paint chopsticks to eat, should choose to use high-quality bamboo chopsticks, or non-toxic and meet the health standards of wooden or plastic chopsticks.

4.50 scientific knowledge of life

1. When taking medicine, do not use tea to send medicine, because tea will be neutralized with the drug, reducing the medicinal properties.

2. Drinking tea when you have a fever is more harmful because the theophylline contained in tea will increase the body temperature and can affect and reduce the effect of drugs, thus aggravating the condition, therefore, tea should not be drunk when you have a fever.

3. Wearing red clothes can absorb and filter out more of the sun's ultraviolet rays, which can reduce the damage of ultraviolet rays on the skin.

4. children do not eat sugar on an empty stomach, because on an empty stomach will affect the normal metabolic function of their bodies

5. fresh eggs in lime water can be preserved, because the eggs exhaled carbon dioxide and lime water reaction generated calcium carbonate plugged to the surface of the egg microporous, to prevent the oxidation of the deterioration.

6. In order to prevent food from moisture and deterioration or deformation, often in the food bag filled with gas carbon dioxide or nitrogen; or in the bag to put the desiccant: quicklime, calcium chloride is important to absorb water, iron is mainly absorbed oxygen and water; or the use of vacuum packaging.

7. The gas inside the swim bladder is important to have carbon dioxide and oxygen

8. When doing trowel, add some soda ash is important to neutralize the acid produced when the flour is fermented, and the carbon dioxide generated can make the bread loose and porous.

9. pesticide residues in vegetables can be soaked in alkaline substances, which can reduce the medicinal properties of pesticides

10. the astringent flavor of the skin eggs can be removed by adding a little vinegar

11. the odor of the refrigerator can be removed with activated charcoal, which makes use of the adsorption properties of activated charcoal.

12. aluminum pot on the scale (the important component is calcium carbonate and magnesium hydroxide), available hydrochloric acid or vinegar to remove

1, hanging on the wall of the quartz clock, when the battery power is exhausted and stop walking, its second hand often stops in the dial on the "9" position. This is due to the second hand in the "9" position by the gravity moment of the largest impediment.

2, sometimes the water pipe in the neighboring faucet when the water, occasionally a burst of sound. This is due to the water from the faucet when the cause of water pipe *** vibration.

3, to take pictures of the TV screen, you should turn off the camera flash and indoor lighting, so that the picture is more clear. Because the flash and lighting on the TV screen reflected light will interfere with the transmitted light of the TV screen.

4. Frozen meat thaws faster in water than in air at the same temperature. A hot nail cools faster in water than in air of the same temperature. Cups filled with boiling hot water are cooled faster when immersed in water than in air at the same temperature. These phenomena show that: the heat transfer of water is better than air,

5, pots of cold water, the bottom of the pot attached to the outer surface of the droplets of water on the flame for a longer period of time to be burned dry, and until the drying is not boiling, this is due to the droplets of water, the pot and the pot of water in the three to maintain the heat conduction, the temperature is roughly the same, as long as the pot of water is not boiling, the droplets will not boil, the droplets of water evaporated in the flame and gradually be Burn dry,

6, out of shape mirror, the farther away from the mirror, the more out of shape. Because the mirror like by the mirror after the reflection of the silver-plated surface formation, silver-plated surface is not flat or uneven thickness of the glass will produce out of shape. Out of shape mirror, the farther away from the mirror, by the principle of light amplification, the silver-plated surface of the reflected light arrives at the location of the deviation from the normal position of the larger, the mirror is more out of shape.

7, natural gas furnace jet nozzle side has a few holes connected to the outside world, but the natural gas will not be sprayed from the side of the small holes, only from the mouth of the jet. This is due to the nozzle at the natural gas flow rate, according to the principles of fluid mechanics, the flow rate is large, the pressure is small, the surface pressure of the gas flow is less than the side of the hole outside the atmospheric pressure, so the natural gas will not be sprayed to the side of the nozzle hole.

8, the balloon will be blown up, pinch the mouthpiece with your hand, and then suddenly let go of the balloon, the balloon inside the gas jet, the balloon due to recoil and movement. You can see that the route of the balloon movement zigzag. There are two reasons for this: one is to blow up the balloon is not uniform in thickness, tension is not uniform, so that the balloon deflated everywhere contraction is not uniform and swing, so that the direction of movement is constantly changing; the second is that the balloon in the contraction of the process of constant change in shape, and therefore in the process of movement of the balloon surface at the air velocity is also changing, according to the principles of fluid dynamics, flow velocity is large, the pressure is small, so the surface of the balloon by the pressure of air is also changing, so the balloon is therefore oscillating. constantly changing, the balloon is therefore swinging, so the direction of movement is constantly changing.

9, ceiling fan in normal rotation when the suspension point by the tension than when not rotating smaller, the greater the speed, the more the tension decreases. This is because the ceiling fan rotation air on the ceiling fan blades have upward reaction force. The greater the speed, the greater this reaction force.

10, electric stove "combustion" is the conversion of electrical energy into internal energy, do not need oxygen, oxygen can only make the wire oxidation and shorten its service life.

11, from the height of the thin piece of paper, even if there is no wind, the route of the paper down also zigzag. This is due to the different parts of the paper convex and concave, the shape of the different, and thus in the process of falling, the surface of the air velocity of the different places, according to the principles of fluid dynamics, the flow rate is large, the pressure is small, resulting in the paper on the air force is not uniform, and with the change in the movement of the paper changes, so the paper is constantly rolling, zig-zagging down.

5.50 scientific knowledge of life

1. When taking medicine, do not use tea to send medicine, because tea and medicine neutralization occurs, reducing the medicinal properties.

2. Drinking tea when you have a fever is more harmful because the theophylline contained in tea will increase the body temperature and can affect and reduce the effect of drugs, thus aggravating the condition, therefore, tea should not be drunk when you have a fever.

3. Wearing red clothes can absorb and filter out more of the sun's ultraviolet rays, which can reduce the damage of ultraviolet rays on the skin.

4. children do not eat sugar on an empty stomach, because on an empty stomach will affect the normal metabolic function of their bodies

5. fresh eggs in lime water can be preserved, because the carbon dioxide exhaled by the eggs and lime water reaction generated calcium carbonate plugged to the surface of the egg microporous, to prevent the oxidation of the deterioration.

6. In order to prevent food from moisture and deterioration or deformation, often in the food bag filled with gas carbon dioxide or nitrogen; or in the bag to put the desiccant: quicklime, calcium chloride is important to absorb water, iron is mainly absorbed oxygen and water; or the use of vacuum packaging.

7. The gas inside the swim bladder is important to have carbon dioxide and oxygen

8. When doing trowel, add some soda ash is important to neutralize the acid produced when the flour is fermented, and the carbon dioxide generated can make the bread loose and porous.

9. pesticide residues in vegetables can be soaked in alkaline substances, which can reduce the medicinal properties of pesticides

10. the astringent flavor of the skin eggs can be removed by adding a little vinegar

11. the odor of the refrigerator can be removed with activated charcoal, which makes use of the adsorption properties of activated charcoal.

12. aluminum pot on the scale (the important component is calcium carbonate and magnesium hydroxide), can be removed with hydrochloric acid or vinegar

6. science and technology, is the life of

Technology Trivia

Plugs Knowledge

Why do most of the household appliances, such as fans, washing machines, refrigerators and so on, use three-wire plugs? What is the difference between a three-wire plug and a three-phase plug?

Three-phase appliances refer to three different firewires, the voltage between each of their two wires is 380 volts, generally used for power systems, mostly found in industrial electricity. Household appliances are generally powered by single-phase power supply, its three wires are fire, zero (neutral) and ground, the voltage between the fire and zero is 220 volts, so this is not three-phase electricity, its plugs and sockets are not three-phase plugs and three-phase sockets, the ground for safety.

Fruits with antihypertensive effect

Hawthorn; Hawthorn expands blood vessels, lowers blood pressure, and lowers cholesterol. You can choose wild hawthorn 10 grains (fresh is better), mashed and sugar 30 grams, water decoction is often served, has a good effect of lowering blood pressure, stomach.

Banana; banana contains many vitamins, can clear heat and lower blood pressure, can be eaten often. Use banana peel or stalk 30~60 grams, decoction soup is also effective. Conditional take appropriate amount of banana flower decoction water service, the efficacy is better.

Water chestnut; have the effect of clearing heat and lowering blood pressure. Available fresh water chestnuts (washed, remove mud), jellyfish (washed to remove salt) 30 to 60 grams each, boiled soup, 3 times a day. Both can lower blood pressure and can dissolve phlegm to stop coughing.

Pineapple: Eating pineapple can strengthen the hydrolysis of fibrin in the body, hypertension and edema, thrombosis, etc. There is a good role in improving blood circulation and eliminating edema and inflammation.

Ume: rich in citric acid, malic acid, succinic acid. For hypertension, dizziness and insomnia, nighttime sleeplessness, can take 3 plums with the right amount of rock sugar stewed in water, with hypotension, sleep, heat and fluids.

Apple: contains malic acid, citric acid, vitamin A, B, C and other 10 nutrients. Eating apples can improve vascular sclerosis.

Scientific drinking milk knowledge 5

Drinking milk is good for health, but many people drink milk there are some concepts on the misunderstanding, now introduce some scientific drinking milk knowledge.

1. Drinking milk on an empty stomach in the morning is not appropriate. Because the human body fast fast gastrointestinal peristalsis, milk nutrients are often too late to be absorbed into the colon in a hurry. In addition, the method of drinking milk is also not desirable, because it will reduce the chance of mixing in the mouth and saliva, is not conducive to digestion and absorption. Before drinking milk, it is best to eat some cookies, pastries, etc., or eat snacks while drinking milk.

2. Drinking milk at night is more favorable. Scientific research has found that the human body in the calcium metabolism will have a special law: the evening, especially at midnight, plasma calcium content will appear a "trough", forcing the body to regulate the mechanism to transport a part of the bone in the calcium to replenish. In this way, although the calcium in the blood is temporarily maintained, the calcium in the bones is reduced. Milk is rich in calcium, so drink a glass of milk before going to bed, can compensate for the body's night on the demand for calcium.

7. Science in the life of common sense thank

Vinegar wonderful

1. Vinegar is the family cooking essential seasonings. Add two drops of white wine and a pinch of salt to vinegar and it becomes balsamic vinegar. When cooking meat or potatoes, a little vinegar makes it easy to stew and tastes good. Add a little vinegar to sweet porridge to make it sweeter.

2. When polishing leather shoes, put a drop of vinegar on them to make them shine for a long time: when copper or aluminum ware is old, rub it with vinegar and wash it, then

it can be restored to its luster; 20 minutes before slaughtering chickens and killing ducks, put a tablespoon of vinegar on them, and then the feathers will be plucked and it will become easy to lift them.

3. Paint on glass, softened with vinegar and wiped off; silk products, after washing, put in a little vinegar added to the water soaked

a few minutes, after drying glossy

8. 50 Science Trivia around

Why the stars will twinkle and twinkle?

When we see stars flickering, it is not because of a change in the luminosity of the stars themselves, but because of atmospheric shading.

The atmosphere separates us from the stars, and when starlight passes through it, it is affected by the density and thickness of the atmosphere. The atmosphere is not absolutely transparent; its transparency varies depending on its density. So when we look at the stars through it at ground level, we will see the stars as if they are twinkling.

2. Why do people yawn?

When we feel tired, our body has produced a lot of carbon dioxide. When there is too much carbon dioxide, more oxygen must be added to balance the body's needs. Because of this residual carbon dioxide, it affects our body's functional activities, and this is when the body sends out a protective response, so it yawns.

Yawning is a deep breathing action, it will allow us to inhale more than usual oxygen and discharge carbon dioxide, but also to do to eliminate the role of fatigue.

3. Why can snakes walk without legs?

Snakes have a lot of scales on their body, which is the outermost layer of armor. The scales are not only used to protect the body, but also as their "feet".

When a snake crawls forward, its body will be in an S shape. Each of the scales on the outside of the S-shape will buckle up to help the snake grip uneven surfaces as it moves forward. These scales and the snake's muscles cooperate with each other, and can push the body to crawl forward, so the snake can walk without feet ah!

4. Why sunflowers always blossom towards the sun

There is a substance called phytochemicals in the stem underneath the disk of the sunflower. This substance has the function of accelerating the reproduction, but it has an aversion to light, and when it encounters light, it will run to the backlight side.

So when the sun rises, the sunflower stems immediately go to the backlit side, and it looks like the whole plant is bending in the direction of the sun.

5. Why do people's hair turn gray when they get old?

There is a substance called melanin in our hair, and the more melanin we have, the darker our hair becomes. The more melanin we have, the darker our hair will be, and the less melanin we have, the more yellow or gray our hair will become. When humans grow old, their body functions will gradually decline, and the formation of pigment will become less and less, so their hair will gradually turn white!

6. Why do fireflies glow?

Fireflies will glow because at the end of their abdomen there is a luminescent apparatus, the luminescent apparatus is filled with a lot of phosphorus-containing luminescent material and luminescent enzymes, so that fireflies can emit a flicker of light.

The purpose of firefly light, in addition to lighting, there are courtship, warning, trapping and other purposes. This is also one of their communication tools, different kinds of fireflies glow, glow frequency and color will be different, they use this to convey different messages.

7. Why does the stomach growl when it is hungry?

When you are hungry, your stomach will gurgle because the food you ate before is almost finished digesting, and although your stomach is empty, the gastric juices will continue to secrete in your stomach. This is because the stomach will continue to secrete gastric juices even though it is empty. The contraction of the stomach will gradually expand, and the liquid and gas inside will be stirred up, resulting in the sound of gurgling.

Next time, don't be embarrassed by your rumbling stomach

This is the first time I've seen the newest version of the Dells.