Millikan’s experiment allowed for the determination of the electron’s mass by using the terminal velocity to calculate it
This is defined as the quantity of matter which is contained a body and the S.I unit is kg.
Millikan's experiment involves the use of oil droplets which were suspended between two electric plates with their charges being determined.
The oil droplets from a fine mist then fell through a hole in the upper plate in which their terminal velocity was used to calculate the mass of each drop.
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