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The Uncertainty Principle — Why Precision Has Limits - Leejohnston - 01-08-2026
The Uncertainty Principle — Why Precision Has Limits
The uncertainty principle sets a fundamental limit on how precisely certain pairs of properties can be known.
Equation:
Δx · Δp ≥ ℏ / 2
Where:
Δx = uncertainty in position
Δp = uncertainty in momentum
ℏ = reduced Planck constant
What this means:
The more precisely you know where something is, the less precisely you can know how fast it’s moving.
Key insight:
• This is not a measurement flaw
• It is built into reality itself
• Nature does not allow exact states
Why this matters:
The uncertainty principle is why atoms don’t collapse, why quantum fluctuations exist, and why reality is probabilistic at small scales.