By adjusting the voltage across the plates, Millikan could suspend a droplet mid-fall, creating a state of equilibrium where the downward gravitational force was exactly balanced by the upward electrical force. The Historical Context and Motivation In the late 19th and early 20th centuries, the nature of electricity was fiercely debated.
Determining the Fundamental Charge E Value in the Millikan Oil Experiment
He recorded the charge of thousands of individual droplets, observing that the values were always integer multiples of a smallest, common unit. This value was essential for calculating Avogadro's number, linking the microscopic world of atoms to the macroscopic scale chemists used daily.
Mass was derived from the droplet's terminal velocity and Stoke's law, accounting for the air's viscosity. Thomson had discovered the electron in 1897, determining its precise charge-to-mass ratio left the fundamental unit of charge, e, unknown.
Determining the Fundamental Charge E Value in the Millikan Oil Experiment
This distribution of charges—clustering around values like 1e, 2e, 3e—provided irrefutable evidence for quantization. Furthermore, the experiment's methodology influenced generations of physicists, demonstrating the power of isolating single particles to probe fundamental constants.
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