What did Robert milikan discosver?

Robert Milikan is best known for his experiments that measured the elementary electric charge of the electron. Through his oil drop experiment conducted in 1909, he was able to determine the charge of the electron with remarkable precision. This work not only provided crucial evidence for the existence of electrons but also contributed significantly to the understanding of atomic structure and the field of electrochemistry. Additionally, Milikan won the Nobel Prize in Physics in 1923 for his achievements.