What is a medium and a substance, and the difference between a medium and a substance

The Chinese character "介" means "separate" and "separate", while "media" is to make the two linked. When a physical phenomenonPassedWhen a substance occurs, it can be referred to as a medium. Further, if the "medium" nature of a substance is emphasized, the substance is called a "medium", and if the "medium" nature of the substance is emphasized, it is called a "medium".

For example, in electromagnetism, the magnitude of the Coulomb force between two point charges in matter (or material) that are not zero away is f=kq1q2 r**2, where the coefficient k is 1/4 epsilon in SI units. Here the constant epsilon is the dielectric constant of the substance, the larger, the smaller the Coulomb force, the "medium" is good, and the material with a large dielectric constant is called "dielectric material"; The ampere force between two non-zero current elements in a substance is f=ki1i2dl1dl2 r**2, where the coefficient k is 4/4 mu, mu is the magnetic permeability of the substance, the larger the ampere force, the "medium" is good, and the material with large permeability is called "ferromagnetic material". Therefore, the electric field problem talks about the "dielectric constant" of the "medium", while the magnetic field problem talks about the "permeability" of the "medium".

Medium refers to the medium matter that propagates such as electromagnetic waves, and matter refers to all things that exist objectively.

A medium is a carrier that is capable of propagating **. Generally speaking, it is a substance in which physical systems exist or in which physical processes (such as the transmission of force and energy, the propagation of light and sound, etc.) take place. The transmission of wave energy requires the quasi-elastic collision finger of a certain substance-based early onset particle.

The composition, shape, density, and motion state of the matter determine the direction and speed of the transmission of wave energy, and the matter that plays a decisive role in the propagation of the wave is called the medium of the wave. Media is divided into optical medium, dielectric, mechanical wave medium, magnetic medium, etc., in addition, the medium also exists outside the definition of physical land, such as language, writing, propagation mode, etc. The medium through which sound is transmitted is solid, liquid, or gaseous.

Its propagation is in the form of sound waves, which can propagate in all directions in three dimensions, or it can propagate in a directional manner. Sound travels in different forms in different media. Generalized sound waves have various forms, such as longitudinal waves, transverse waves, and surface waves.

It propagates in the form of longitudinal waves in gases. It propagates in liquids in longitudinal and surface waves. In solids, transverse waves are dominant.

The sound produced by a person is transmitted by the large slow expansion or contraction of the air, so it is a longitudinal wave. Usually what we call sound waves travel through the air.

The medium is the transfer of wave energy and requires the quasi-elastic collision of some kind of material elementary particles to achieve it. The composition, shape, density, and state of motion of this substance determine the direction and speed of the transmission of wave energy, and this substance, which plays a decisive role in the propagation of waves, is called the medium of this wave.

The medium is the substance that plays a decisive role. When one substance exists inside another, the latter is the medium of the former.

In some wave-like motions, such as sound waves and light waves, the propagating material is called the medium of these wave-like motions. The medium is called the medium.

In addition, media also exist outside the physical definition, such as language, writing, propagation, and so on.

Explanation of medium (1) [medium] (2) one substance exists in another substance, the latter is the medium of the former, and (3) the substance by which certain wave-like motion (such as sound, light, waves, etc.) propagates in detail. When one substance exists inside another, the latter is the medium of the former; The substances through which certain wave-like motions (such as sound waves, light waves, etc.) propagate are called the medium of these wave-like motions. The explanation of the word decomposition intermediary è is in between:

It's somewhere in between. Prepositions (words used before nouns and pronouns, combined to indicate the relationship between place, time, direction, and manner, such as "from", "to", "in", "to", "to", "for", etc.). Intervention.

In this way, so: like the explanation of the essence of the essence (as if there really is such a thing, the essence (quality) ì ontology, nature: matter.

Fluid (something that flows in a banquet state that is not solid). Parenchyma. Question (truth).

Sandy. Essence. Particle.

Quality. Sexual bond essentia. Diathesis.

Aptitude. Plain and auspicious, simple: simple.

Straight. Questioning, discerning, reproaching: questioning.

Question. Inquiry and inquiry. Confrontation. Resist.

Medium: When one substance exists inside another, the latter is the medium of the former; The substances through which certain wave-like motions (such as sound waves, light waves, etc.) propagate are called the medium of these wave-like motions. Also called medium.

The medium is mainly divided into: gas, liquid, solid.