In 1909, American physicist Robert Andrews Millikan - who had studied in Europe under Walther Nernst and Max Planck - measured the charge of individual electrons with unprecedented accuracy through the oil drop experiment, in which he measured the electric charges on tiny falling water (and later oil) droplets.
Pada tahun 1909, fisikawan Amerika Robert Andrews Millikan - yang pernah belajar di Eropa di bawah Walther Nernst dan Max Planck - mengukur muatan elektron individual dengan akurasi yang belum pernah terjadi sebelumnya melalui percobaan tetesan minyak, di mana dia mengukur muatan listrik pada tetesan kecil air (dan kemudian minyak).