Why is it warm in summer and cold in winter? Why is it hot in summer and cold in winter? Why is it cold in winter
If you are interested in this question and are looking for an answer to this question, then after reading this article you will definitely find the answer.
Why is it so cold in winter?
The temperature in winter directly depends not on the distance of the planet to the Sun, but on the angle of inclination of the Earth. The tilt axis of our planet passes through 2 poles: South and North. While the angle of inclination moves the Northern Hemisphere away from the Sun, the days become shorter, the sun's rays fall less on the earth's surface and warm it up worse. As a result of such phenomena, winter comes.
Why is it so hot in summer?
In summer, everything happens the other way around - the North Pole is at a very close distance to the Sun, due to this, it receives the maximum amount of sunlight, the days become longer, and the air temperature increases. As a result of such phenomena, summer comes.
Why is it so much warmer in summer than in winter? In summer, the sun's rays hit the Earth perpendicularly, due to this, solar energy is more concentrated and warms the soil faster than usual, so it is very hot in summer. In winter, these same rays do not fall perpendicularly to the earth's surface; they glide without warming up either the soil or the water. The air does not heat up and remains just as cold. In summer, the flow of solar energy is much greater than in winter, then it weakens and becomes smaller.
Ecology of consumption. Estate: Everyone wants their home to be reliable, comfortable and warm all year round. And the main thing is to build quickly and inexpensively. Standard frame houses meet all these requirements. They are warm in winter and cool in summer.
Everyone wants their home to be reliable, comfortable and warm all year round. And the main thing is to build quickly and inexpensively. Standard frame houses meet all these requirements. They are warm in winter and cool in summer. Therefore, such housing construction in Japan reaches 45-50%, in the USA, Canada, Norway, Sweden - 75-80%, in Germany, Finland and other Western European countries - 50% and in Scandinavian countries - 80%.
What is a frame building?
This is a structure that consists of a frame installed on a foundation - vertically installed wooden beams. The gaps between them are filled with insulation. On the outside and inside, these walls are sheathed with OSB, OSB, and sandwich panels. The appearance of the building depends on the finishing. For decorative cladding, siding or clinker tiles, thermal panels, stones or timber are used.
For the manufacture of frames, coniferous wood and wooden beams are most often used. Metal frames are rarely used, as they increase the cost of construction by 55-75 percent.
The installation of the structure of one building, depending on the chosen technology, takes from one to three to four months. To do this, you need to have drawings of frame houses, which experts consider the most labor-intensive and painstaking process.
Having appeared almost simultaneously in different countries, frame housing construction developed in its own ways. The most common are Canadian technologies, German technologies of half-timbered houses and pre-fabricated panel houses. They have the same construction principle. And they differ in the materials used and their combinations, the level of industrialization of the production of house kits, and the method of installation and fastening of some structural elements.
To keep the house warm
It is impossible to build a warm frame house without using good insulation, so special attention is paid to its selection.
To insulate an eco-house, straw, hemp bonfire, cellulose and other eco-insulation materials are used. After the cells of the frame are filled with insulation, a vapor barrier must be installed on the inside, and water and wind protection on the outside.
If you do not plan to live in the house all year round, then it is more profitable to install a stove for solid fuel, increasing the thickness of the insulation to 25 cm during construction. After all, the air in a frame house heats up quickly due to the use of frame technologies and insulation.
Experts have calculated that heat consumption per 1 square meter of area of a frame house is almost two times less than in brick houses.
When deciding to build a frame house, you must first select a project, calculate the amount of materials and their types not only for the foundation and main structure, but also for the roof, attic, basement, and decorative finishing. Of course, you can build it yourself, but specialists can do it faster and better. published
Romanenko Igor
In this work, the student, in collaboration with the teacher and parents, made attempts to theoretically study the issue on the topic, conducted an experiment at home, provided a description of the experimental work and drew conclusions, thereby confirming and refuting the hypotheses put forward.
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MBOU Mariinskaya Gymnasium
Research work
on the topic “Why is it warm in summer and cold in winter?”
I've done the work
3rd grade student B
MBOU "Mariinskaya Gymnasium"
Ulyanovsk
Romanenko Igor.
Supervisor
Semenova I.A.,
primary school teacher.
Ulyanovsk 2016-2017 academic year
2. Research methods.
3. Hypotheses.
4.1. Studying the theory on the problem “Why is it warm in summer and cold in winter?”
5. Conclusions.
6. Literature
7. Applications.
1. Subject and objectives of the study.
We all know very well that the Sun behaves differently at different times of the year. In summer it rises early, goes high in the sky and sets late. In winter, on the contrary, the Sun appears above the horizon late and, having made a low and short journey across the sky, sets early. In summer the days are long and the nights are short; In winter the days are short and the nights are long. In spring and autumn, day and night differ little in duration. How can all this be explained? After all, we know that the change of day and night, that is, the rising and setting of the Sun, occurs because the Earth rotates around its axis. Why doesn't it spin the same way all year round? Or maybe the length of day and night depends on some other reason? And how does the sun behave at different times of the year? Why is it warm in summer and cold in winter?
I am very interested in this topic, and in my work I will try to answer all the questions posed.
2. Research methods.
- I tried to answer the question myself: “Why is it cold in winter and warm in summer?”
- I talked to my parents.
- I read children's encyclopedias "My first encyclopedia"« All about planets and constellations", "Big Children's Encyclopedia".
- Together with my parents, I found information on the issue of interest on websites on the Internet.
- I conducted experiments on the movement of the Earth around the Sun.
- I observed changes in nature at different times of the year.
3. Hypotheses:
At the beginning of my research, in order to try to answer the main question “Why is it cold in winter and warm in summer?”, I put forward several basic assumptions:
Hypothesis 1 . In summer, the whole world rejoices, flowers bloom, vegetables and fruits grow, berries and mushrooms ripen. In autumn, nature prepares for bed. And when nature falls asleep, Winter covers it with a blanket - snow. And the snow is cold, so it gets cold.
Hypothesis 2 . It is warmer in summer because the Earth is closer to the Sun at this time.
Hypothesis 3 . In summer, the sun rises higher above the horizon. Accordingly, more direct rays enter the Earth’s atmosphere and heat it up for longer. That's why it's warm in summer. In winter, on the contrary, the Sun is lower above the horizon and heats less. That's why it's cold at this time of year.
4. Theoretical and practical part
4.1 Studying the theory on the problem “Why is it warm in summer and cold in winter?”
We all live on the planet Earth - this is our house. In mythology, her Greek name was Gaia. The earth was the mother of mountains, valleys, streams and all other formations of the earth. She was married to Uranus. On Earth there is a change in time of day and seasons. Earth is the largest of all the terrestrial planets. Currently, almost 7.5 billion people live on our planet. About 30% of the Earth's surface is covered by land, while 70% is covered by oceans.
But she's not alone in space. Our planet Earth is part of the solar system.
The solar system is the sun and the collection of planets that are in the same orbit with the sun and depend on it. There are 9 planets in our solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto. Mercury is the closest planet to the sun, and our Earth is the third. Among these planets, only ours has life. It is located at the most favorable distance from the sun. If it had been a little closer to him, we would have burned, a little further, we would have frozen in the glaciers. Some planets have satellites that orbit around them and with them around the sun. For example, the satellite of our planet is the Moon.
Sun Today it is the largest object in the Solar System. 98% of all matter in the solar system is located inside the sun. This means that all the planets, moons, asteroids, minor planets, comets, gas and dust would all collectively constitute only 2% of all matter in the solar system. The sun is so big that the earth could easily fit inside Sun a million times. The sun has a gravitational force, that is, attraction. Therefore, the planets always revolve around it at the same distance and do not fly away into open space.
The Romans called the Sun Sol, which in English means Sun. In Ancient Greece, the Sun was called Helios. This is why our system of planets is called the Solar System.
But why is it warm in summer and cold in winter?
The path along which the globe moves in outer space has the shape of an elongated circle - an ellipse. The sun is not at the center of this ellipse, but at one of its foci. Therefore, throughout the year, the distance from the Sun to the Earth changes periodically: from 147.1 million km (at the beginning of January) to 152.1 million km (at the beginning of July). The transition from the warm season (spring, summer) to the cold season (autumn, winter) does not occur at all because the Earth is either approaching the Sun or moving away from it. But even today many people think so! Take a look at the numbers above: The Earth is further from the Sun in June than it is in January!
The fact is that the Earth and other planets of the solar system, in addition to revolving around the Sun, rotate around an imaginary axis (a line passing through the North and South Poles).
If the Earth's axis were at right angles to the Earth's orbit around the Sun, we would have no seasons and all days would be the same. But this axis is tilted relative to the Sun (by 23°27"). As a result, the Earth rotates around the Sun in an inclined position. This position remains the same all year round, and the Earth's axis is always directed to one point - the North Star.
Therefore, at different times of the year the Earth exposes its surface to the sun's rays in different ways. When the sun's rays fall vertically, straight, the Sun is hotter. If the rays of the Sun fall on the earth's surface at an angle, then they heat the earth's surface less.
The sun always stands directly on the equator and in the tropics, so the inhabitants of these places do not experience cold weather. There the seasons do not change as abruptly as here, and there is never snow.
At the same time, for part of the year, each of the two poles is turned towards the Sun, and the second part is hidden from it. When the Northern Hemisphere is turned toward the Sun, countries north of the equator have summer and long days, while countries to the south have winter and short days. When the direct rays of the Sun fall on the Southern Hemisphere, summer begins here, and winter begins in the Northern Hemisphere.
The longest and shortest days of the year are called the winter and summer solstice. The summer solstice occurs on June 20, 21 or 22, and the winter solstice on December 21 or 22. And all over the world, every year there are two days when day is equal to night. This happens in spring and autumn, exactly between the days of the solstice. In the fall, this happens around September 23 - this is the autumn equinox, in the spring around March 21 - the spring equinox.
Now let’s talk about the topic: “How the change of day and night occurs.”
Let's imagine. The summer morning has arrived. The sun appeared. But it is still low in the sky and warms very weakly. When the Sun rises higher, the Earth will begin to warm up, and you can even run barefoot. And in the evening the Sun sinks lower and lower. And the Earth begins to cool again.
This happens in winter too. During the day, when the Sun rises higher, the snow begins to melt. Sound drops fall from the roofs. They will fall silent only in the evening, when the Sun goes low.
All this happens due to the rotation of the Earth around its own axis and the angle of its inclination relative to its orbit around the Sun.
It turns out: the low Sun provides almost no warmth. And the higher it rises, the hotter its rays become.
4.2. Making observations about changes in nature at different times of the year.
I observed nature, how it changes throughout the year, what happens to plants, how the Sun behaves, at what time it comes out and sets. During my walks, I tried to notice the slightest changes in nature.
At the beginning of summer, the Sun rises high above the sky and begins to heat up more intensely, the days become long, and the evenings become long and warm. Nature is blooming and ripening, the gardens are full of greenery, the meadows are covered with a wide trail of green grass. Heavy cumulus clouds slowly soar in the sky, like huge ships. In the summer we can walk outside for a long time, play ball and ride a bike, swim in ponds, and sunbathe. You can see many different insects in the grass, and butterflies on the flowers. This is my favorite time of year.
Warm and hot days smoothly transition into the month of August, which is milder than July, because the daylight hours are noticeably shorter, and the nights become cooler and a foggy haze appears. From the beginning of the month, the water in lakes and ponds cools down, ending the swimming season. The average temperature in the first half of August is +17 +19° C. August itself is the calmest month of the year. Thunderstorms rarely occur, and hot, dry days are somewhat less common. The weather is often evenly warm, and in some places the first yellowed leaves appear on the trees, harbingers of autumn.
The beginning of autumn is September. This is the time of Indian summer, when it is dry and warm, and nature is gradually preparing for the cold. This is the most mushroom time and the time when you can watch the first birds prepare to fly to warmer climes. If you look at the sky, you can see how the birds are increasingly clustered and huddled in flocks. And the forest becomes quieter, the leaves turn more noticeably yellow and leaf fall will soon begin.
It’s getting cooler, you can now button up your jacket and don’t forget to take an umbrella with you. After all, the autumn weather is capricious, and the rain is not as warm as in summer.
In autumn, nature slows down its development and prepares for winter; bushes and trees shed their leaves; birds fly away to warmer regions, and those animals that remain dress in warm fur coats; The weather becomes colder and towards the end of autumn the first snow falls.
But one day in November you can look out the window in the morning and see how white everything is. There is snow everywhere. And it may still, most likely, melt, but winter is not far away.
Winter is coming! The forest puts on fluffy white coats. Water in rivers and lakes freezes and turns into ice. But now you can skate. If the snow is wet, you can make a snow woman or build a snow fortress and play snowballs, and if it’s dry, then take a whirlwind ride down the mountain on a sled.
In winter, nature sleeps, covered with a white blanket of snow and ice; winter birds are found on bare tree branches; animals leave footprints in the snow; sometimes there are blizzards and frosts; the days are short and the nights are long and cold. Only from mid-February will the Sun begin to warm up, when its falling rays begin to imperceptibly warm your cheeks from the icy frost.
With the arrival of spring, nature awakens. The sun is shining brightly, the snow is melting, birds from warmer climes will soon return to the forest, filling the forest with singing. The birds are about to sing, the flowers will bloom, and the forest will be dressed in green foliage.
The snow begins to melt in the sun and turns into water. You can make a boat out of paper and launch it along a cheerful stream in the yard.
Streams fill the lakes with water. Birds are flying in. If you come closer to the trees and look closely at the branches, you can find small fluffy lumps on them. These are buds - the first leaves will soon appear from them. Birds build nests, insects appear in the forest, and the entire flora and fauna awakens from hibernation.
4.3. Conducting an experiment on the influence of the Sun on the Earth.
I did a little experiment. For this I needed a table lamp, it played the role of the Sun and a globe, it played the role of the Earth.
To simplify the experiment, I left the globe (Earth) motionless, fixed in one position, and rotated the lamp (Sun) clockwise, thereby simulating the Earth’s orbit, having chosen a reference point in advance.
In photo No. 1 – summer, since the Earth’s axis is tilted towards the Sun, and the rays fall on its surface at right angles, greatly heating the surface.
In photo No. 2 – winter, since the Earth’s axis is tilted in the opposite direction from the Sun and the rays fall on it at an angle, so the heating of the surface is weak.
In the photo No. 3 and 4 - spring and autumn, respectively. During these periods of time, the length of day and night are the same - the days of the equinox.
And as can be seen from the experiment, the Sun during this period does not heat very much - like in summer, but not weakly - like in winter.
5 . Conclusions.
As a result of the work I did:
a) Hypothesis 1 “changes in nature occur due to the change of seasons” was confirmed based on my observations of changes in nature at different times of the year.
b) Hypothesis 2 “The closer the Earth is to the Sun, the warmer it is” was not confirmed, because the change of seasons is affected not by distance, but by the angle of inclination of the Earth’s axis relative to the Sun.
c) Hypothesis 3 “The higher the Sun is above the horizon, the hotter it is and vice versa” was confirmed, because during the experiment, I was convinced that if the sun is higher above the horizon, it warms the Earth more. This happens in the summer. And in winter, accordingly, it warms less, as it rises lower above the horizon.
6. Literature
1. Great children's encyclopedia.
2. My first encyclopedia. Popular science edition for children. Galnershtein L.Ya.
3. Everything about planets and constellations. Atlas-directory.
9 . seasons-goda.rf
We are accustomed to the seasons changing. Winter is replaced by spring, followed by summer, and then autumn... For us, this is a common occurrence.
Changing the temperature
In winter we freeze from the cold. And it's hot for us in the summer. We eagerly await the arrival of warmth. However, the transition period when the temperature becomes most comfortable for us, as a rule, does not last very long. And the hot, dry summer comes. There is a fairly sharp change in temperature.
As a rule, we are busy with our daily affairs and do not think about why this happens. Why is it cold in winter and hot in summer? What influences this change of seasons?
Why is winter cold?
We all know from our school years that our Earth rotates around the Sun and around its own axis. Naturally, during its movement the planet either approaches the Sun or, on the contrary, moves away from it.
We have a stereotype that winter comes when the Earth is at the farthest distance from the source of heat and light. But it is not so. After all, there is another important factor - the Earth's tilt axis.
It passes through the North and South Pole. It turns out that when the angle of inclination moves away from the luminary, the day becomes short, the rays of the Sun seem to glide along a tangent and do not warm the surface so well. As a result of this, winter comes to us.
Why is it hot in summer?
But in the summer the opposite happens. As soon as the northern part of the Earth is at the closest distance from the Sun, it receives a huge amount of rays, daylight hours increase, air temperature increases very quickly, and summer comes.
In summer, the rays of the Sun fall on the earth's surface almost perpendicularly. Therefore, the energy is more concentrated and heats the soil very quickly. Because in summer it’s hot, there’s a lot of sun. In winter, the sun's rays seem to glide across the surface; they cannot warm up either the soil or the water. The air remains cold.
It turns out that in summer the flow of energy falling on the earth’s surface is much stronger and greater, and in winter it becomes smaller and weaker... Temperature indicators depend on this. In addition, we know that in summer the length of daylight hours is much longer than in winter. This means that the Sun has a lot of time to heat the Earth’s surface.
Changing seasons by zone
If summer begins in the northern hemisphere, then it is winter in the southern hemisphere, because at this time it is far from the Sun. The same thing happens in the second half of the year: it becomes much warmer and even hot in the southern hemisphere, and winter sets in in the northern hemisphere.
Meanwhile, different zones of the Earth have completely different climatic conditions. This is explained by proximity or distance from the equator. The closer you are to it, the hotter the climate, and vice versa, the further you are from it, the colder the climate conditions.
In addition, the weather is influenced by many factors. This is both proximity to the sea and altitude relative to the level of the World Ocean. After all, the mountains are quite cool even in summer, and there is snow on the peaks even in the heat.
Of course, the equator is an imaginary line running through the center of the Earth. But it is closest to the Sun, regardless of the axis tilt of our planet. It is for this reason that regions near the equator are constantly languishing from excess amounts of energy. The temperature here does not fall below twenty-four degrees. It's not only hot here in the summer. There is no winter in our understanding at all. The sun's rays hit the surface near the equator at almost a right angle, which gives the earth's surface in this region the maximum amount of light and heat.
Climate warming
Summer weather always pleases us with warmth, an abundance of sunny days, and long daylight hours. However, each season there is the establishment of abnormally hot weather for some time in regions uncharacteristic for such temperatures. This instantly sparks talk of “global warming.” Scientists argue a lot about this issue. Some paint downright threatening pictures of the future of this phenomenon. Others don't see anything wrong with it. However, everyone is still trying to unravel the cause of this phenomenon. There are quite a lot of assumptions. But there is no single reliable and correct one. Therefore, you should just enjoy the summer warmth and sun, sea and flowers, river and hot sand. After all, summer passes so quickly. And you can tolerate excessively hot weather, it’s worth it. But so many wonderful things await us at this time; nature beckons us to relax and enjoy life.
Why is it cold in winter and warm in summer? and got the best answer
Answer from Oblom[guru]
due to the fact that the earth is round and rotating on an axis around the sun, read the textbook
Answer from cornflower[guru]
It’s warm in the summer, because everyone walks around lightly dressed, some in just thongs, which heats up the air, but in winter, on the contrary, they put on fur coats and there’s nowhere for the air to get warm, so it gets cold...
Answer from ***
[guru]
The thing is that there are 4 seasons and their change is caused by the rotation of planet Earth around the Sun. This happens in 365 (366) days, but at the same time the Earth also manages to rotate around its axis every 24 hours. This is how the days change.
If the Earth's axis (the imaginary line from the North to the South Pole) were at right angles to the Earth's orbit around the Sun, we would have no seasons and all days would be the same. But the Earth's axis is tilted.
The fact is that various forces act on the Earth. Firstly, this is the attraction of the Sun, secondly, the attraction of the Moon, and thirdly, the rotation of the Earth itself. As a result, the Earth rotates around the Sun in an inclined position. This position persists all year round, so the Earth's axis is always directed to one point - the North Star.
This means that part of the year the North Pole is turned towards the Sun, and the second part is hidden from it. Because of this tilt, the direct rays of the Sun sometimes illuminate the area of the Earth's surface north of the equator, sometimes at the equator, sometimes south of the equator. It is the varying exposure of areas of the earth's surface to direct sunlight that causes the seasons to change in different areas of the globe.
That is, winter occurs in the Southern Hemisphere if direct sunlight hits the Northern Hemisphere and vice versa. During winter, the sun illuminates both hemispheres, but some of the rays are scattered, so they are not able to warm the hemisphere to the same extent. This is what causes the cold in winter.
Isn't it strange: when winter reigns in the northern hemisphere, the Earth is 4,500,000 km closer to the Sun than when it is summer there.
The fact is that in this case the weather is determined not by the distance from our planet to the Sun, but by the inclination of the earth's axis relative to the plane of the earth's orbit. The angle of this inclination is 23.5 degrees.
The Earth rotates around the sun in such a way that its axis is always directed towards the North Star. Therefore, during one half of the year the North Pole of the earth tilts towards the Sun, and during the other half it deviates from it. In the first case, summer reigns in the Northern Hemisphere, in the second - winter. In South, of course, everything is the other way around.
The weather in a particular region of the earth depends on the angle at which the sun's rays fall on a given area of the earth's surface. In winter, the low sun illuminates the earth with sliding rays, and in summer they fall vertically. Grazing rays heat the Earth's surface less for two reasons. Firstly, because the same amount of heat is distributed over a larger area in winter than in summer. Secondly, in this case the rays pass through a thicker layer of air in the earth’s atmosphere, which leads to large losses of their thermal energy.
Climate is determined not only by the amount of heat entering a particular area of the Earth's surface from the Sun, but also by other factors. For example, in the vast seas and in the areas adjacent to them, temperature changes with the changing seasons are not so great. On the contrary, in the interior of the continents the difference between winter and summer temperatures is much greater. This occurs due to the fact that the earth cools and heats up much faster than water. Another factor influencing the weather is the difference in altitude above sea level. As altitude increases, air density decreases, and therefore its ability to retain heat decreases. As a result, the climate in mountainous areas is much colder than in the plains.