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Different branches of physics with definitions and topics


What is physics?

branches of physics

The branch of science which deals with the interaction of matter and energy is called physics.

The rapid progress in science during the recent years has become possible due to discoveries and inventions in the field of physics.The technologies of our modern society throughout the world are related to physics.For example a car is made on the principle of mechanics and a refrigerator is based on the principles of thermodynamics.

Importance of physics in our daily life

In our daily life we hardly find a device in which laws of physics are not involved.


  • Pulleys are used to lift heavy loads.
  • Electricity is used to get light,heat and mechanical energy that drives fans and electric motors.
  • Means of transportation such as car and aeroplanes,domestic appliances such as air conditioner,refrigerators,vacuum cleaners,washing machines and microwave oven etc.
  • The means of communication such as radio,TV,telephone and computer are the result of applications of physics.These devices have made our lives much easier and faster and more comfortable than the past.
  • Computer is the invention of physics.

Branches of physics list

In practical field,the common branches of physics are:

10 branches of physics and their definition


It is the study of motion of objects,its causes and effects.

Sub branches of mechanics are:

  • Classical mechanics
  • Kinematics
  • Dynamics
  • Statistical mechanics
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Thermodynamics (Heat)

It is the study of nature of heat,modes of transfer and effects of heat.


It is the study of physical aspects of sound waves,their production,properties and applications.


It is the study of physical aspects of light,its properties and use of optical instruments.

Electricity and Magnetism

It is the study of the charges at rest and in motion,their effects and their relationship with magnetism.

Atomic physics

It is the study of the structure and properties of atoms.

Nuclear physics

It is the study of properties and behavior of nuclei and the particles.

Plasma physics

It is the study of production,properties of the ionic state of matter.


It is the study of the internal structure of the earth.

Classical physics

The branch of physics that deals with newton’s laws of motion,law of gravitation,Maxwell’s kinetic theory and thermodynamics.

The classical physics is mostly related with energy and matter which are considered as different entities.Main branches of classical physics are Acoustics,optics ,classical mechanics and electromagnetic.

Major subtopics of classical physics

  • Classical mechanics
  • Electromagnetism
  • Thermodynamics

Quantum physics

Major subtopics of Quantum physics

  • Quantum mechanics
  • Quantum statistics
  • Quantum electrodynamics
  • Quantum field theory

Relativistic Physics

  • Special relativity
  • General relativity
  • Einstein field equations

Modern physics

It is the branch of physics which deals with theory of relativity and quantum mechanics.Max plank and Einstein are consider the father of modern physics.

Bio Physics

Bio physics is the branch of physics in which we study about biological problems and phenominas by using techniques of physics.Major application and achievement of bio physics is D.N.A.

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The branch of physics which deals with the study of universe such as stars,planets and galaxies etc


Electronics is the branch of physics in which motion of electron is controlled by  using semiconductor devices.

Chemical physics

It is the study of science of physical relations which involved in chemistry.

Engineering physics

It is the study of fields of physics and engineering.


It deals with physical processes and their relations in the science of economy.

Health physics

It involves the protection of people work with are near radiation.

Mathematical physics

It is the study of mathematical systems that stands for physical phenomena.

Molecular physics

It examines the structure, properties, and behavior of molecules.

Particle physics

It is also called high energy physics, analyses the behavior and properties of elementary particles.


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