Capacitance, ability of a circuit system to store electricity.
The capacitance of a capacitor is measured in farads and is determined by the formula C = q/V, where q is the charge (in coulombs) on one of the conductors and V is the potential difference (in volts) between the conductors.
The capacitance depends only on the thickness, area, and composition of the capacitor's dielectric.

Dielectric Absorption

This is the phenomenon where after a capacitor has been charged for some time, and then discharged, some stored charge will migrate out of the dielectric over time, thus changing the voltage value of the capacitor. This is extremely important in sample and hold circuit applications. The typical method of observing Dielectric Absorption is to charge up a cap to some known DC voltage for a given time, then discharge the capacitor through a 2 ohm resistor for one second, then watch the voltage on a high-input-impedance voltmeter. The ratio of recovered voltage (expressed in percent) is the usual term for Dielectric absorption.

S.I. UNIT

The capacitance of a condenser is measured in farads.
A condenser of 1 farad capacitance will exhibit a change in potential difference of 1 volt between its plates when 1 coulomb of electricity is transferred from one plate to the other.

Symbol

The standard abbreviation for capacitance is C and the symbol for farads is letter F.