The shortest physics paper ever: 27 words noting 6π⁵ equals the proton-electron mass ratio

JosephJacks_ · x · 2026-11-04

Friedrich Lenz's 1951 paper The Ratio of Proton and Electron Masses is famously the shortest physics paper ever published: just 27 words, one equation, and one reference. It notes that the most precise value then known for the proton-to-electron mass ratio, 1836.12, coincides exactly with 6π⁵ = 1836.12.

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