Heisenberg Uncertainty Principle

The Heisenberg uncertainty principle states that you cannot simultaneously know both the exact position and exact momentum (or velocity) of a quantum particle.

$\Delta x\cdot \Delta p\ge \frac{\hslash }{2}$
Where:

• $\Delta x$ = uncertainty in position.
• $\Delta p$ = uncertainty in momentum.

You do not notice this in daily life. For a baseball or a car, Planck’s constant is so tiny compared to the object’s mass that the uncertainties are practically zero. It only matters at the atomic and subatomic scale.