Walter Kaufmann | |
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| Born | June 5, 1871 |
| Died | January 1, 1947 (aged 75) |
| Citizenship | German |
| Known for | Proof of the velocity dependence of mass |
Walter Kaufmann (June 5, 1871 – January 1, 1947) was a German physicist. He is best known for the first experimental proof of the velocity dependence of mass, which was an important contribution to the development of modern physics, including special relativity.