In 1819, significant advancements were made in the field of electromagnetism. The Danish physicist Hans Christian Ørsted discovered that electric currents create magnetic fields, a finding that laid the groundwork for future studies in electromagnetism. This discovery was pivotal in understanding the relationship between electricity and magnetism. Additionally, the year saw the publication of John Dalton's work on atomic theory, which further developed the idea that matter is composed of indivisible particles called atoms. Dalton's research provided a scientific basis for understanding chemical reactions and laid the foundation for modern chemistry.