protonladdningsvärde
Protonladdningsvärde, often referred to as the elementary charge, is a fundamental physical constant that represents the magnitude of the electric charge of a single proton. It is also equal in magnitude but opposite in sign to the electric charge of a single electron. This value is quantized, meaning that any observable electric charge in nature is an integer multiple of this elementary charge.
The protonladdningsvärde is denoted by the symbol 'e'. Its accepted value in SI units is approximately 1.602176634
The concept of quantized charge was first experimentally demonstrated by Robert Millikan in his oil-drop experiment