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Quantum Mechanics

Definition

Quantum mechanics is a branch of physics that deals with phenomena on a very small scale, such as molecules, atoms, and subatomic particles. It's characterized by the principle of wave-particle duality, superposition, and uncertainty.

Analogy

Imagine if you were playing a video game where the characters could exist in multiple places at once, disappear and reappear somewhere else instantly or change their state based on whether they're being watched or not. That's kind of what quantum mechanics is like—it defies our everyday logic but is essential for understanding how things work at tiny scales.

Related terms

Wave-Particle Duality: The concept in quantum mechanics stating that every particle or quantum entity can be partly described not only as a particle but also as a wave.

Superposition Principle: A fundamental principle in quantum mechanics that holds that any two (or more) quantum states can be added together ("superposed") and the result will be another valid quantum state; and conversely, that every quantum state can be represented as a sum of two or more other distinct states.

Heisenberg Uncertainty Principle: A key principle in quantum mechanics which states it's impossible to simultaneously measure the exact position and momentum (speed) of a particle. In other words, the more precisely one property is measured, the less precisely the other can be controlled or determined.