# Basics of Quantum Mechanics

__Quantum Mechanics:__

Quantum state is a conglomeration of several possible outcomes of measurement of physical properties. Quantum Mechanics is the study of matter and its interactions with energy on the scale of atomic and subatomic particles. A particle is an indivisible mass point object that has a variety of properties that can be measured, which we call observables. The observables specify the state of the particle.

A system is a collection of particles, which interact among themselves via internal forces. It can also interact with the outside world via external forces. The state of a system is a collection of the states of the particles that comprise the system. Quantum mechanics uses the language of probability theory. The basics of quantum mechanics are given below: