# Quantum Mechanics - I

Updated: Sep 7, 2019

**Quantum mechanics is the branch of physics relating to the very small. **

**It results in what may appear to be some very strange conclusions about the physical world. At the scale of atoms and electrons, many of the equations of ****classical mechanics****, which describe how things move at everyday sizes and speeds, may not be useful. In classical mechanics, objects exist in a specific place at a specific time. However, in quantum mechanics, objects instead exist with probability; they have a certain chance of being at point A, another chance of being at point B and so on.**