See also: 1803 in science, other events of 1804, 1805 in science, list of years in science

Table of contents

1 Chemistry 2 Exploration 3 Geology 4 Meteorology 5 Technology 6 Awards 7 Births 8 Deaths

Chemistry

• William Hyde Wollaston discovers palladium, and how to make malleable platinum
• Jons Jacob Berzelius discovers cerium

• May 14 - The Lewis and Clark Expedition departs from Camp Dubois and begin their historic journey by traveling up the Missouri River

• Alexander von Humboldt discovers that the Earth's magnetic field decreases from the poles to the equator

• Joseph Louis Gay-Lussac and Jean Baptiste Biot study the atmosphere from a hot-air balloon

• Richard Trevithick produces his first railway locomotive

• Copley Medal: Smithson Tennant

• July 20 - Richard Owen, anatomist and paleontologist († 1892)
• October 24 - Wilhelm Eduard Weber, physicist († 1891)
• December 10 - Carl Gustav Jakob Jacobi, mathematician († 1851)
• John Gould, zoologist († 1881)
• Robert Schomburgk, explorer († 1865)
• William Stokes, physician († 1878)
• Heinrich Lenz, physicist († 1865)
• Matthias Schleiden, biologist († 1881)