What was the purpose of Millikan's 'oil drop' experiments of 1908 to 1913? - Leaving Cert Chemistry - Question (d) - 2016

The primary purpose of Millikan's 'oil drop' experiments was to measure the magnitude of the electric charge of an electron. Through careful observation and manipulation of charged oil droplets suspended in an electric field, Millikan was able to determine the charge of individual electrons.

These experiments provided essential evidence supporting the quantization of electric charge and allowed for the calculation of the fundamental charge value, which is approximately $1.6 \times 10^{-19}$ coulombs. This work not only advanced the understanding of atomic structure but also played a significant role in the development of modern physics.