William Crookes
English chemist and physicist; discovered thallium and pioneered vacuum tubes.
His observations of cathode rays led him to posit a fourth state of matter, 'radiant matter,' a foundational contribution to plasma physics.
- field
- Chemistry, Physics
- nationality
- English
- known_for
- Discovery of thallium, Crookes tube, Crookes radiometer, fourth state of matter (plasma), Crookes Lenses
Lore & Background
His father was a wealthy tailor and real estate investor.
Reader's Guide
Sir William Crookes's significance lies in his diverse contributions across chemistry and physics. His discovery of thallium via spectroscopy demonstrated the power of that analytical method. His invention of the Crookes tube and subsequent experiments with cathode rays laid experimental groundwork for later discoveries of the electron and plasma physics. Though his interpretation of 'radiant matter' as molecular particles was superseded by J. J. Thomson's subatomic model, Crookes's work was foundational. The Crookes radiometer, while misunderstood by its inventor, became a classic demonstration device. Historian William H. Brock argues that this work laid the foundation for the modern sunglasses industry. Crookes's legacy thus spans pure science, instrumentation, and practical safety applications.
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