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A system of units based primarily on the forces between electric charges.
- ‘His work on the ratio between the electrodynamic and electrostatic units of charge in 1855 proved extremely important and was crucial to Maxwell in his electromagnetic theory of light.’
- ‘The technical definition is the amount of X or gamma radiation that produces one electrostatic unit of ionic charge in one cubic centimeter of dry air at standard temperature and pressure.’
- ‘If an electric force of one unit (one dyne) arises between two equal electric charges one centimetre apart in a vacuum, the amount of each charge is one electrostatic unit, esu, or statcoulomb.’
- ‘After all, electrostatic units were devised by the early physicists presumably because they were convenient for the results they obtained.’
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