This Day in History — Chemistry
April 20, 1862 — First Pasteurization Test Completed - Lous Pasteur
Biology Chemistry Inventors Science
On April 20, 1862, Louis Pasteur and Claude Bernard completed an early pasteurization test, proving heat could control harmful microorganisms. This breakthrough helped end beliefs in spontaneous generation, protected food supplies, and advanced germ theory—laying the foundation for modern microbiology, safer food preservation, and major public health improvements worldwide.
March 20, 1800 — Volta Invents the First Battery
Chemistry Inventors Science Scientific Discovery
On March 20, 1800, Alessandro Volta introduced the first electric battery, the voltaic pile, providing a steady source of electrical current. This breakthrough transformed electricity from a scientific curiosity into a practical tool, laying the foundation for modern technology, electrochemistry, and countless innovations that continue to power the world today.
March 6, 1869 — Mendeleev Reveals the Periodic Table
Chemistry Science Scientific Discovery
On March 6, 1869, Dmitri Mendeleev introduced the first periodic table to the Russian Chemical Society, revealing a pattern among the elements based on atomic weight. His system not only organized known elements but predicted several yet to be discovered, establishing one of the most important frameworks in modern science.