The oil drop experiment was an experiment performed by Robert Millikan and Harvey Fletcher in 1911 to measure the elementary electric charge (the charge of the electron).
The experiment entailed balancing the downward gravitational force with the upward drag and electric forces on tiny charged droplets of oil suspended between two metal electrodes. Since the density of the oil was known, the droplets' masses, and therefore their gravitational and buoyant forces, could be determined from their observed radii. Using a known electric field, Millikan and Fletcher could determine even the charge on oil droplets in mechanical equilibrium. By repeating the experiment for many droplets, they confirmed that the charges were all multiples of some fundamental value, and calculated it to be 1.5924(17)×10−19 C, within 1% of the currently accepted value of 1.602176487(40)×10−19 C. They proposed that this was the charge of a single electron.
Read more about Oil Drop Experiment: Background, Fraud Allegations, Millikan's Experiment As An Example of Psychological Effects in Scientific Methodology
Famous quotes containing the words oil, drop and/or experiment:
“Opinions are to the vast apparatus of social existence what oil is to machines: one does not go up to a turbine and pour machine oil over it; one applies a little to hidden spindles and joints that one has to know.”
—Walter Benjamin (1892–1940)
“There is regret. Always, there is regret.
But it is better that our lives unloose,
As two tall ships, wind-mastered, wet with light,
Break from an estuary with their courses set,
And waving part, and waving drop from sight.”
—Philip Larkin (1922–1986)
“That which we call sin in others, is experiment for us.”
—Ralph Waldo Emerson (1803–1882)