# What is Heisenberg Uncertainty Formula?

1. Oct 20, 2012

### ZedCar

2. Oct 20, 2012

### Staff: Mentor

The "correct" version is

$$\Delta x \Delta p \ge \frac {\hbar} {2}$$

It assumes that the "deltas" are defined as the usual statistical standard deviation.

People often use simplified versions that differ by small numerical factors, when they're not concerned with being rigorous, but simply want an order-of-magnitude type statement.

3. Oct 20, 2012

### ZedCar

Thank you for that.

4. Oct 20, 2012

### Studiot

Please note the difference between h (Planck's constant) and hbar = h/2∏ (reduced Planck's constant).

Google will find plenty.