How are clouds formed?
Tiny water droplets or tiny ice particles form clouds in the sky. Because when sunlight shines on ponds, lakes, rivers and seas, the water in these places evaporates and rises. It then condenses and crystallizes into tiny drops of water or ice particles and floats in the air. They are the funny clouds you often see.
Clouds in the sky are sometimes high and low, the high clouds are more than 10km, the low ones are about tens of meters. There are many causes of cloud formation, the main one being the rising of moist air. The volume of these water droplets is very small, they are the components that make up clouds, its average radius is only a few micrometers, but the density is very large, the rate of decrease in the air is very small, can trapped in the air, so it can float in the air and become clouds.
Why do I feel like everything is spinning when I’m dizzy?
For example, you are on an airplane during a storm, the plane is stuffed up and down while your eyes look at the scene inside the plane but do not notice any movement, causing dizziness. Dizziness occurs when the central nervous system receives out-of-sync signals from the five systems.
Dizziness is a disturbance in the balance of the body in space. Our bodies are kept in balance by systems: in noting the up and down, back and forth movements of the head; eyes detect body movements in space; pressure to the ground; The muscles and joints record movement of the limbs and trunk.
The central nervous system coordinates all of the above information and gives us a sense of our place in space. Dizziness occurs when the central nervous system receives out-of-sync signals from the five systems above.
Why is there a rainbow?
When science had not yet developed, it was believed that the rainbow appeared to bring miracles and mysteries. As for Christians, they believe that after the Flood, God placed a rainbow in the sky and told Noah, “This is a sign of a new covenant between God and the Earth”. As for the ancient Greeks, they believed that the rainbow was the goddess Iris.
In fact, a rainbow is basically the reflection of sunlight through water droplets in the air, this phenomenon is also known as light refraction. Only when shone through a glass prism do the rays of light are refracted to form a continuous band of colors that we call a spectrum. Therefore, here, water droplets can also replace the role of a prism, refracting the sun’s rays, but provided that the sun’s rays must meet the drop of water at a relatively small angle, called the angle. deflection of the rainbow.
Why do I feel dizzy when I look down at the top?
Climbing up will be stimulated by air pressure and wind sound, along with visual stimulation when looking down. These factors will affect the balance structure in the ear. This makes us temporarily lose our sense of balance, causing dizziness, and even vomiting, like motion sickness.
The cerebellum is also responsible for balancing movements. When the stimuli are strongly impacted on the cerebral cortex, the most advanced neural “command” of the human body, through vision and hearing to affect the cerebellum, causing a series of electrical activities. biological, disrupting cerebellar function for a short time, making us dizzy. So why does this phenomenon occur when going to a high floor, but not to a high mountain? The problem is very simple.
Since the high floor is straight up, it creates a sharp contrast of elevation with the surrounding scenery, so the stimulus is stronger. Going up the mountain, even though the mountain is many times higher than the building, because its height is gentle, gradually increasing, the difference from the surrounding is not obvious, standing on this mountain still sees many other mountains undulating, so does not produce strong stimulation, has little effect on human nerves.
Why is the sky blue?
When light enters the Earth’s atmosphere, the shorter wavelengths will be absorbed and scattered by gas molecules. The light emitted from the sun consists of many colors, each with a different wavelength. The absorbed short-wavelength light is then scattered outward in many different directions. Blue light has a relatively short wavelength, so molecules in the air scatter it around, staining the sky blue. Therefore, when you look up above your head, the sky will always be blue.
You will wonder, purple has a shorter wavelength than blue, why is the sky not purple? The main reason is due to the activity of the human eye in seeing colors. When the sky is a mixture of blue and purple, the cones in the human eye react to a mixture of blue and white. Just like when you mix red and green, you get yellow, this is the same problem, in the end the signal sent to the nervous system is just blue.
Why sleep dreaming?
Dreaming is a phenomenon in which the human mind experiences imaginary images, sounds, and a variety of intense emotions during sleep. Dreaming has been recorded not only in humans but also in most birds and mammals. Dreams are divided into two types: normal dreams and lucid dreams
We don’t simply lay down and sleep until morning, instead, our bodies go through many complex changes as we sleep. The sleep cycle consists of 4 stages: lull, light sleep, deep sleep, and REM (rapid eye movement) sleep. The duration for a sleep cycle is 90 minutes. In a night of 7-8 hours, the average person will go through 4-6 sleep cycles.
To this day, the category of dreaming still has many unexplainable mysteries and is a fascinating topic attracting much attention from the scientific community. It can be said that each person will have a different brain, different living circuTaxances, different relationships, different ways of living and sleeping time. All these differences will create different dreams including spiritual dreams, dreams that convey deep thoughts in the mind or simply have no meaning.
Why are leaves green?
This question is probably easier to answer, because biology has already been mentioned. Leaves are green because the leaves contain a large percentage of chlorophyll, the green substance of the leaves. Sunlight has 7 colors red, orange, yellow, green, blue, indigo, purple. The reason chlorophyll is green because it attracts light rays of other colors, especially red and blue, but does not absorb green, and reflects this color, so our eyes see color. green leaves.
In addition, the two sides of a leaf also have different density, because chlorophyll in the upper part of the leaf facing the sun will be more than the lower part of the leaf facing the ground. New leaves are usually light green in color because the chlorophyll is less then. As they grow, chlorophyll is also more abundant, the leaves are darker green.
Why do people sleep or grind their teeth?
Teeth grinding during sleep is a movement disorder in sleep that causes two teeth to clench, putting pressure on the teeth and making a creaking sound. Teeth grinding is not a rare habit but grinding teeth while sleeping is a disease syndrome. If this condition is prolonged and occurs regularly, it is not only uncomfortable for the person sleeping with you, but your teeth and jaw can also be damaged and have many serious complications.
Teeth grinding is not a rare habit but grinding teeth while sleeping is a disease syndrome. If this condition is prolonged and occurs regularly, it is not only uncomfortable for the person sleeping with you, but your teeth and jaw can also be damaged and have many serious complications.
Teeth grinding is a condition in which the two teeth are pinched and squeezed, clenching puts pressure on the teeth and can produce a creaking sound. If you have bruxism, you may be unconsciously grinding your teeth while awake or grinding your teeth while sleeping. Teeth grinding has been linked to a number of psychiatric disorders, such as Parkinson’s disease, dementia, gastroesophageal reflux disease, epilepsy, night terrors, and sleep disorders such as sleep apnea. sleep and hyperactivity/lack of concentration.
Why is the night sky black?
In 1965, when the Big Bang theory was born, scientists proved that the universe was not eternal but had a beginning in the past. The night is dark because there are not enough stars to fill the sky, while the number and lifespan of stars are inherently finite;
In addition, as astronomer Edwin Hubble did in 1929 on the Doppler effect of light emitted by galaxies, he found that galaxies are moving further and further away from their location. its original mind. As a result, light takes more and more energy to reach us, making the galaxy brighter, the luminous energy in the sphere of the horizon decreases, the density of the dark night increases.
Why do ears drop down when airplanes take off and land?
It is very simple because the aircraft during takeoff or landing needs to raise the head higher than the tail. For example, during take-off, the front part must fly up first, and when landing, the two rear forks of the aircraft need to touch the runway first to balance the weight of the aircraft. The ear part as you say bends down to let the air flow to the ground and at the same time lifts the plane up so that the plane flies high or lifts so that the plane lands safely and gently. The simple principle here is that thrust is needed to lift the plane.
Airplane Tinnitus occurs when the pressure in the middle ear and the ambient pressure are out of balance, causing the eardrum to vibrate abnormally. In the ear there is a part called the eustachian tube (connected to the middle ear) that is responsible for regulating and equalizing pressure. But when the plane takes off and lands, the air pressure changes so quickly, the eustachian tube often does not respond in time, causing the symptoms of tinnitus when flying. The act of swallowing or yawning causes the eustachian tube to widen, allowing more air to enter the middle ear, equalizing the pressure.
Why does the ear know where the sound is coming from?
The structure of the human ear consists of: the outer ear, the middle ear, and the inner ear. If both ears receive the signal, the situation is different. One of the bases for us to recognize the direction of sound is the time difference between the two ears. If the sound source is to the right of the listener, the sound waves reach the right ear a moment faster than the left ear. Using an accurate meter will show that, even if the time difference is only 30% of a second, one can still recognize the direction of the sound.
A psychological experiment showed that, if only one ear receives the stimulation of two groups of sound waves in succession, from two sides of equal intensity, equal distance, but in different directions, the sound wave effect of the two groups with the same ear. Thus, one cannot distinguish the direction of the sound source. If both ears receive the signal, the situation is different.
One of the bases for us to recognize the direction of sound is the time difference between the two ears. If the sound source is to the right of the listener, the sound waves reach the right ear a moment faster than the left ear. Using an accurate meter will show that, even if the time difference is only 30% of a second, one can still recognize the direction of the sound. The second base is the difference in sound intensity. The sound source may hit the nearby ear a little harder than the other. Even small intensity is enough for us to determine the exact position of the noise to the left or right.
Why is there fog?
Fog is the phenomenon of water vapor in the atmosphere condensing into very small water droplets that float in the air and reduce our visibility. Fog and fog are both dangerous meteorological phenomena. Especially for road, river, sea and air transportation, every year fog causes obstacles and significant losses.
Fog in our country often occurs frequently in the months from late autumn to late spring, the most and strongest in the winter months. Nowadays, the air environment is more and more polluted, so fog and haze occur more and more intense.
Fog is a meteorological phenomenon that we often see and is also very concerned. However fog is not always present. Basically, in order for fog to form, it must satisfy some of the following conditions:
- The relative humidity of the air must be high.
- The air temperature is relatively low.
- Wind speed is weak or calm.
Fog usually occurs when the air from the water surface, ponds, lakes, rivers and streams with high relative humidity moves to the area with lower buffer surface temperature.
Why are ocean waves white?
In fact, ocean waves can be thought of as broken glass particles. Therefore, to make it easier for us to visualize and explain why sea water is blue but ocean waves are white, let’s study the properties of glass. We break a colorless transparent glass, the glass fragments are then still transparent, if collected in a pile, it will be whiter. The more broken the glass, the whiter the color of the pile being culled. In particular, if the glass is broken into powder-like glass particles, it will look like a pile of snow.
Why is that? Because glass can penetrate sunlight, in addition to reflection, there are many refractions, light rays after undergoing many times of refraction or scattering in different directions. When we encounter those rays, it creates a feeling of whiteness. Waves are the same, it also makes light rays dim, so when you look at them, you will see the waves are white.