The Millikan oil drop experiment, conducted by Robert A. Millikan in 1909, aimed to determine the fundamental unit of electrical charge, known as the elementary charge (e), and to measure the mass of oil droplets. Millikan's experiment involved suspending charged oil droplets in an electric field and observing their behavior.
Millikan's measurements provided a range of values for the charge and mass of the oil droplets, and the results were not exact values but rather statistical averages. However, the most commonly cited value for the elementary charge obtained by Millikan was approximately 1.60 x 10^-19 coulombs. This value is very close to the currently accepted value of the elementary charge, which is 1.602 x 10^-19 coulombs.
The mass of the oil droplets varied, but they were typically on the order of magnitude of 10^-15 kilograms (or 10^-12 grams). The exact values depended on the specific experimental conditions and the size of the oil droplets being studied.
It's important to note that the actual data obtained by Millikan included a range of measurements, and the results were subject to statistical uncertainties. Nevertheless, the experiment provided crucial evidence for the quantization of electrical charge and helped determine the value of the elementary charge with high precision.