← Back to Atlas PHYSICS
Uncertainty Principle
Nature limits simultaneous precision of certain pairs like position and momentum.
Updated: 2026
Key ideas
Not a measurement mistake
Uncertainty is built into quantum states, not just imperfect instruments.
Conjugate quantities trade precision
Tighter localization in position implies broader momentum spread.
Useful engineering constraint
It shapes atomic stability, tunneling, and sensor design.
Mental model
- Represent a particle with a wave packet.
- Narrow the packet to localize position.
- Observe momentum components spread out accordingly.
FAQ
Can better technology beat uncertainty?
No, only redistribute uncertainty between conjugate variables.
Does it apply to macroscopic objects?
Yes in principle, but effects are tiny and hidden by decoherence.
Is it only about position and momentum?
No. Energy-time and other operator pairs have related limits.