What is Classical Physics modern physics and branches

Classical Physics

This term is Chinese . In addition, it was used to refer to the physics that existed before the appearance of quantum mechanics, including different branches of study such as thermodynamics, optics, acoustics, electromagnetism, among others. Classical physics is also called that which existed before 1900 and modern physics includes the years from 1900 onwards, the advent of quantum mechanics has given so-called classical physics a new perspective.

modern physics

To make a parenthesis before proceeding with the explanation of the different branches of classical physics, it is necessary to differentiate it from modern physics.

Max Planck begins his “quantum” energy investigations in the early 20th century, which explained that they consist of energy particles that are not divisible.

It was then that this new branch of physics was born, which seeks to study the variations that exist in atoms, the different behaviors that occur with matter and the forces that govern them. Modern physics studies phenomena that occur at the speed of light or values ​​that approach it.

Likewise, the emerging problems could not be solved with approaches from classical physics, for this it was necessary to organizational culture. Only with this data will HR be able to rethink the investigations and assumptions of classical physics and adapt the term of modern physics to the studies and theories corresponding to the area.

What are the branches of classical physics?

For a better study of science, its main branches have been classified over time, thus, the human being has managed to perform better in these areas in an optimized way and communicate to the world the new advances of these studies.


The human ear is designed to perceive waves, they must be subjected to a study process that demonstrates their lengths and capabilities. That’s why acoustics was born, this branch of classical physics is in charge of studying all wave vibrations to be finally interpreted as sounds.

The study of acoustics involves musical, geological, submarine and atmospheric phenomena, in general terms, this branch of physics is responsible for studying the sounds that are emitted in the terrestrial field.

On the other hand, this presents the psychoacoustics, which is responsible for studying the effects at the physical level that arise in biological systems.


This branch is related to physical bodies when they are subjected to displacement forces and, of course, to the effects that arise when subjected to these forces.

It is considered a subdiscipline that deals with the study of physical phenomena that occur to objects that are study of social classes stands out. This topic involves many aspects and can be understood from different angles; therefore, it is the subject to the physical forces of particles that are in a state of rest or in motion, but significantly less than the speed of light.


Magnetism and electricity come from electromagnetic forces, it is then that electromagnetism is the branch of classical physics that describes how the process of interaction between electricity and magnetism.

In order to know this branch in depth, it is necessary to emphasize that the magnetic field is created by means of an electric current in movement, and said magnetic field is capable of inducing an electric current or, failing that, charge movement.  

Mainly, in its origins, electromagnetism was considered as the study of the phenomena that occurred around rays and the radiation that was produced as an effect of light.

Likewise, magnetism was able to be present in objects such as compasses to make a guide for the path, before it was used for this purpose.

The phenomenon of particles at rest was observed mainly by the Roman culture that, when seeing how an effect appeared when rubbing a comb, attracted new particles. In summary, it was concluded that positive charges repel and opposites attract.

fluid mechanics

This branch of classical physics studies the existing flow of liquids and gases, from this branch arise other subdisciplines such as hydrodynamics and aerodynamics.

Fluid mechanics is applied in the following disciplines: calculation of forces applied to airplanes, oil fluid mass, prediction of climatic factors.


This branch of classical physics deals with the study of visual phenomena and properties of light including its possible interactions with matter.

It describes all processes that occur in visible, ultraviolet and infrared light. This is because light is primarily an electromagnetic wave like X-rays, microwaves and radio waves themselves that have similar waves.

This branch is essential for many disciplines tasked with studying the phenomena associated with it, such as medicine, photography, astronomy and engineering.


We continue with thermodynamics, this branch of physics studies the effects of work, energy and heat on a specific system. It is a relatively new branch of physics since it was born in the XNUMX th century with the birth of the steam engine. In short, thermodynamics is responsible for observing and measuring the different phenomena that occur.

The small gaseous interactions that occur on this scale are called or described by the kinetic theory of gases. They are terms that relate to each other to complement the methods that describe thermodynamics or kinetic theory. There are three laws that govern thermodynamics and they are the Law of Enthalpy , which leads to the law of entropy and therefore the third is born, which is the zero law .

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