Does Ether exist. 30

Aether does not exist, and the conduction of light does not need a medium, to be specific, it is too long, I recommend you to read a book, "Does God Roll the Dice", many problems in quantum physics are explained quite clearly, including historical related arguments and verifications, as well as simple and easy-to-understand explanations, the writing is also very vivid, and there is also a large introduction to the problems of aether, go and see it

No medium is required for light conduction!

Trouble, there are too many issues involved;

1.Vacuum is not absolute, and a theoretical vacuum cannot be obtained, especially in the quantum world2Light has wave-particle duality, which is both matter and waves.

3.Aether is a fictional concept in the past, which has been abandoned for many years, but in recent years, some scientists have put the concept of aether on the stage for research according to matter, so this aether is hard to say.

or rely on yourself as a medium", a bit contradictory!

Aether does not exist, and the conduction of light does not need a medium, to be specific, it is too long, I recommend you to read a book, "Does God Roll the Dice", many problems in quantum physics are explained quite clearly, including historical related arguments and verifications, as well as simple and easy-to-understand explanations, the writing is also very vivid, and there is also a large introduction to the problems of aether, go and see it

To put it bluntly, electromagnetic waves are alternating electromagnetic fields that do not require a medium.

If you really want to say that the aether exists, I think the aether is a vacuum—if you are willing to think of the vacuum as a substance.

Permeability and permittivity are substances = 》 (Rate is substance.

Ether is a hypothetical medium for the propagation of electromagnetic waves, but it has since been proven to be non-existent.

In the 19th century, scientists gradually discovered that light is a kind of wave, and most of the waves in life need a propagation medium (for example, the transmission of sound waves needs to use air, and the propagation of water waves needs to use water, etc.). Influenced by traditional mechanical ideas, they hypothesized that there was a substance called aether everywhere in the universe, and that it was this substance that played a role as a medium in the propagation of light.

According to Maxwell's equations, the propagation of electromagnetic waves requires an "absolute" frame of reference, and only in this frame of reference does the speed of light have the value predicted by Maxwell's equations c= frac}. where varepsilon 0 is the vacuum permittivity and 0 is the vacuum permeability. This "absolute frame of reference" is the ether.

The measured speed of light in other frames of reference should be the vector sum of the speed of light in this "absolute" frame of reference and the velocity of this "absolute" frame of reference relative to the observer.

According to the conjecture at the time, the aether filled the entire universe, and electromagnetic waves could travel through it. The Earth revolves around the Sun and has a velocity v relative to the aether, so if the speed of light is measured on Earth, the values measured in different directions should be different, with a maximum of c+v and a minimum of c-v (there is an assumption that the aether is stationary relative to the solar reference frame). But even if the aether is not stationary relative to the solar frame of reference, the values measured in different directions should be different).

But in 1881-1884, Albert Michelson

Michelson) and Edward Morey

To measure the relative velocity of the Earth and the ether, Morley conducted the famous Michelson-Morey experiment, which measured the speed of light in different directions. However, experimental results show that there is no such difference in speed. This actually proves the principle of invariance of the speed of light, i.e. the speed of light in a vacuum has the same value in any frame of reference, regardless of the relative velocity of the frame of reference, and the ether does not actually exist.

Later, many experiments supported the above conclusions.

The theory of ether has been ingrained in people's minds for a period of time, profoundly influencing the thinking of physicists. The famous physicist Lorentz deduced the Lorentz transform formula that satisfies the conditions of electromagnetism covariance, but he could not abandon the idea of ether. Albert Einstein boldly abandoned the aether theory, believing that the speed of light is the basic principle, and used this as one of the starting points to create the special theory of relativity.

Although it turned out that there was no ether, the ether hypothesis still left traces in our lives, such as Ethernet.

In the late nineteenth century, scientists believed that their complete description of the universe was nearing completion. They imagine that a continuum called the ether fills the universe, and like sound waves in the air, light and magnetic signals are waves in the ether. However, the result that contradicts the idea that space is completely filled with "ether" does not appear long after:

According to the theory of "ether", it should be concluded that the speed of light propagation should be a fixed value relative to "ether", so if you travel in the same direction as the light rays travel, the speed of light you measure should be lower than the speed of light you measure at rest; Conversely, if you are traveling in the opposite direction of light propagation, you should be measuring the speed of light higher than you would be at rest. However, a series of experiments have not found evidence of the difference in the speed of light. Of these experiments, Alport Michelson and Eddie Ward Murray's 1887 measurements at the Case Institute in Cleveland, Ohio, USA, were the most accurate and detailed.

They compared the propagation speed of two rays at right angles, and because of the rotation around the axis of rotation and the revolution around the sun, according to the reasoning, the earth should pass through the "ether", so the two rays at right angles should be measured at different speeds due to the movement of the earth, and Murray found that neither day nor night, nor winter or summer, caused the difference in the speed of light between the two rays. Whether you're moving or not, light always seems to travel at the same speed relative to you. The Irish physicist George Fitzgreid and the Dutch physicist Hendrick Lorenz were the first to think that objects moving relative to the "ether" would shrink in size in the direction of motion, while clocks moving relative to the "ether" would slow down.

As for the "ether", both Fitzgreid and Lorentz considered it to be a real substance at the time. At this time, a young man named Alport Einstein, who worked at the Swiss Patent Office in Bern, the capital of Switzerland, intervened in the "ether" theory and solved the problem of the speed of light propagation once and for all. In his 1905 article, Albert Einstein pointed out that since you can't detect whether you are moving relative to the "ether", the whole concept of the "ether" is redundant.

On the contrary, Einstein believed that the laws of science should have the same form for all observers of free motion, and that they should measure the same speed of light regardless of how the observer moves. Einstein's idea requires people to abandon the universal concept of time measured by all clocks, and the result is that each person has his own value of time: if two people are relatively stationary, then their time is the same; If there is mutual movement between them, the time they observe is different.

Aether is a substance conceived by the ancient Greek philosopher Aristotle. It is an imaginary concept of matter in the history of physics, and its connotation has evolved with the development of physics. The word "ether" is a transliteration of the English ether or aether.

The ancient Greeks used it to refer to the blue sky or upper atmosphere.

Ether originally came from a substance conceived by ancient Greek philosophers, an invisible and intangible substance that filled the space of the universe. Space is not empty, it is filled with the medium matter of the ether. Although the ether cannot be felt by the human senses, it can transmit the effects of forces, such as magnetism and the force of the moon on the tides.

After the establishment of the theory of electromagnetic waves in the mid-19th century, the aether was assumed to be an ubiquitous medium that conducts electromagnetic waves (light and non-electromagnetic waves propagate through space through the substance of the aether).

Until the beginning of the 20th century, aEinstein established the theory of relativity, and finally rejected the hypothesis of the ether.

It doesn't exist, that's what the scientists of ancient Greece conjectured.

Definition of LAN technology terms.

Chinese name: local area network English name: local area network; lan

Definition: A small area of computer network covering a geographical area such as one or several buildings, a campus, or a factory.

Applied Disciplines: Communication Science and Technology (First-level Discipline); Communication Network (Secondary Discipline) The above content shall be approved and published by the National Committee for the Examination and Approval of Scientific and Technological Terms.

A local area network (LAN) is a group of computers that are interconnected by multiple computers in a certain area. Generally, it is within a radius of several thousand meters. LAN enables functions such as file management, application software sharing, printer sharing, scheduling within workgroups, e-mail and fax communication services, and more.

A LAN is closed and can consist of two computers in an office or thousands of computers in a company.

Therefore, you can only understand Ethernet as a super-super-large local area network, but its definition has gone beyond the meaning of the word local, so your statement is incorrect!

The specific meaning of ether is as follows:

Aether is a term in the history of physics, and its meaning has evolved with history. In ancient Greece, ether referred to the blue sky or upper atmosphere. In cosmology, ether is used to denote the matter that occupies the space of celestial bodies.

In the 17th century, Descartes was the first to introduce the ether into science and give it certain mechanical properties. Later, the ether was associated with the wave theory of light as a load for light waves. Subsequently, the aether also gained a place in electromagnetism, and the electromagnetic aether was unified with the aether of light.

In the 90s of the 19th century, Lorentz attributed the electromagnetic properties of matter to the effect of electrons associated with atoms, and then the aether theory began to gradually decline.

In order to maintain the constant speed of light, the theory of relativity subverts and distorts our view of time and space, bringing about countless incomprehensible paradoxes about time and space. However, modern physical science is still faced with many difficult problems (dark matter, dark energy, irreconcilable contradiction between relativity and quantum mechanics), and it is helpless. The development of science is close to science fiction (multidimensional space, time and space travel, parallel universes, curvature-driven).

All of this violates Occam's razor's law.

Acknowledging that the speed of light is variable, and determining the existence of aetheric shooting, these problems do not exist. Aether is the only key to exploring and interpreting the universe. However, this is wrong.

It's troublesome to be hungry, and this problem involves too much;

1.Vacuum is not absolute, and a theoretical vacuum cannot be obtained, especially in the quantum world.

2.Light has wave-particle duality, which is both matter and waves.

3.Aether is a fictitious concept in the past, and it has been carefully abandoned for many years, but in recent years, for the study of matter, some scientists have put the concept of aether on the stage again, so this aether is hard to say.

or rely on yourself as a medium", a bit contradictory, ah Xiangliang.