Static Electricity 2000 Edition

D.1.24 Dissipative.
Used to describe materials having a sur-
face resistivity between 10
5
ohms per square and 10
11
ohms per
square.
D.1.25 Double Layer.
A phenomenon usually associated with
a solid/liquid interface where ions of one charge type are
fixed to the surface of the solid and an equal number of
mobile ions of opposite charge are distributed through the
neighboring region of the liquid. In such a system, the move-
ment of liquid causes a displacement of the mobile ions with
respect to the fixed charges on the solid surface.
D.1.26 Electrometer.
A device used to measure static electric
charge with high-input impedance, typically greater than 10
13
ohms, which draws negligible current from the measured
object.
D.1.27 Electrostatic Field.
The electric force per unit charge
that is produced by a distribution of charge; also called the
electric field intensity or potential gradient. An electric field
can be most easily thought of as lines of influence originating
from unit positive charges and terminating at unit negative
charges or at infinity. It is therefore closely related to charges
on surfaces and in gas streams.
D.1.28 Electrostatic Field Meter.
A device that estimates the
electric field from a charged object by sensing the charge and
the charge polarity on the surface of a conductor or insulator.
D.1.29 Faraday Cage.
An electrically continuous, conductive
enclosure that provides a shield from static electricity (region
of no electrostatic field). The cage or shield is usually,
although it need not be, grounded.
D.1.30 Field Suppression.
The observed reduction in elec-
tric field away from an object when it is brought near a
grounded object. The effect results from a repositioning of
the electric field lines toward the grounded surface.