Quantum mechanics is the science that deals with the behaviour of matter and light on the level of atomic and subatomic scale. Quantum mechanics aim to describe and understand the properties of molecules, atoms including the constituents like electrons, neutrons, protons and other particles like gluons and quarks. These properties even include particle interaction between each other and with the electromagnetic radiation like the gamma rays, X-rays, light etc.

The consequences of quantum theory are difficult to be understood and believed in owing to the fact that matter and radiation exhibit peculiar behaviour on the atomic level. The concepts of quantum mechanics very often conflict with the observations of the daily world and the notions of common sense.

But then, the atomic world doesn’t have to confine to the reasoning of the large scale world. Quantum mechanics describes and accounts for the way of the world –both, small scale and the large one- and is not based on mere imaginations or assumptions.

Studying quantum mechanics helps in illustrating the important and vital methodology of physics. It also gives accurate and correct results in each situation in which it is applied. However, in spite of the practical successes that this field garners, the foundations of the mechanics have unresolved issues like that of the nature of measurement. Quantum mechanics claim that it is impossible to measure a system without even disturbing it.

##### SIX KEY CONCEPTS IN THE FIELD OF QUANTUM MECHANICS

- Everything is made of waves and particles. Objects in quantum physics belong to a category which shares some properties of waves (like frequency, wavelength) and some properties of particles (like can be counted or given a degree). For example, light is said to have a dual nature.
- Quantum physics is discreet. It talks about substances in discrete amounts.
- There is a lot of probability in the case of quantum physics. It is impossible to predict the outcome of any experiment in a quantum There is always probability or comparisons between theory and outcomes.
- Quantum physics believes in the existence of systems in which measurements made at different geographical locations can be correlated in many ways which that suggests that one’s outcome depends on another.
- The quantum phenomenon is confined to the scales of the atom and other fundamental particles. The velocities, masses etc are too small to be seen directly.
- Quantum mechanics is always constrained by the mathematical rules, principles and hence is logical.