What Is ยท Science

Quantum Tunneling

Particles slipping through barriers

Quantum tunneling is when particles described by wavefunctions cross potential barriers despite insufficient classical energy.

Definition

Quantum states extend through barriers; a small probability allows crossing.

Why It Matters

Explains fusion in stars and enables tunnel diodes and Josephson junctions.

Where You See It

Scanning tunneling microscopes measure tunneling currents to image surfaces.

Related Terms