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attofarad
One-quintillionth (10-18) of a farad.
The farad is defined as the amount of capacitance for which a potential difference of one volt results in a static charge of one coulomb.
Capacitance is a measure of the amount of electric charge stored (or separated) for a given electric potential.
A coulomb (symbol: C) is the SI unit of electric charge. It is named after Charles Augustin de Coulomb who was a French physicist.
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