1925–1927Reputable source · 2 sourcesWell documented
The Quantum Mechanics Revolution
On the timeline · around 1925–1927 ·
What happened
In the mid-1920s a generation of young physicists built quantum mechanics into a full theory. Werner Heisenberg framed it in terms of matrices and his 'uncertainty principle' — that a particle's position and momentum cannot both be known exactly — while Erwin Schrödinger described particles as spreading waves. The new physics was probabilistic: it predicted only the odds of outcomes, and the act of measurement changed what was measured.
Why it matters
Quantum mechanics is the most successful and precise theory in the history of science, explaining atoms, chemistry, and the behaviour of matter. It also underlies modern technology, from transistors and lasers to computers.