State the expression for Heisenberg.s uncertainty principle.

Explanation

### Step-by-Step Solution:

1. **Understanding the Principle**:
Heisenberg's Uncertainty Principle states that it is impossible to simultaneously know both the exact position and exact momentum of a microscopic particle. This principle highlights a fundamental limit to measurement in quantum mechanics.

2. **Concept of Measurement**:
When we try to measure the position of a particle, we often use light (photons) to observe it. However, the act of measuring the position with light imparts energy to the particle, which changes its momentum. This interaction makes it impossible to measure both properties with perfect accuracy at the same time.

...