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 There are two main branches of physics: pure physics and applied physics:
  • Pure Physics - It is the study of matter and energy and their relationships (properties) to each other.
  • Applied Physics - It is a combination of pure physics and engineering put to practical use.

These are the Major Branches of Physics

Classical Mechanics Electromagnetism Quantum Mechanics Relativity  (Relativistic) Thermodynamics & Statistical Mechanics
  • Electricity
  • Electrodynamics
  • Electrostatics
  • Magnetism
  • Magnetostatics
  • Maxwell's Equations
  • Optics
  • Path Integral Formation
  • Scattering Theory
  • Schrodinger Equation
  • Quantum Field Theory
  • Quantum Statistics Mechanics
  • Einstein Field Equations
  • General Relativity
  • Special Relativity
  • Cryocoolers
  • Entropy
  • Heat Engine
  • Kinetic Theory of Gases
  • Particle Statistics
  • Thermodynamic Ensembles

Dimensionless numbers have a quantity of one and can not be measured on a scale of physical units. dimensionless numbers banner 2

For formula info see Nomenclature & Symbols for Engineering, Mathematics, and Scienceor  nomenclature symbol banner 2