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molecular conductance • monitor system 455
and the volume (in liters) of a solution that contains
1 gram molecule of the solute. Also see
SOLUTE; SOLUTION, 1; and SOLVENT, 1, 2.
molecular conductivity See MOLECULAR CON-
DUCTANCE.
molecular electronics The technique of processing
a single block of material so that separate areas
perform the functions of different electronic
components. The entire block constitutes a circuit
(e.g., a MONOLITHIC INTEGRATED CIR-
CUIT).
molecular magnets According to the molecular
theory of magnetism, the elemental magnets
formed by individual molecules.
molecular theory of magnetism Each molecule in
a piece of magnetic metal is itself a magnet (possessing
a north and a south pole). These tiny
magnets are thought to be normally oriented at
random, but when the material is magnetized by
an external force, they align themselves with each
other.
molecular weight Abbreviation, mol wt. In a
molecule of a substance, the sum of the atomic
weights of the constituent atoms.
molecule The basic particle of a compound; each
molecule usually contains two or more atoms.
For example, the formula AgNO 3 represents silver
nitrate, each molecule of which contains one
atom of silver (Ag), one atom of nitrogen (N), and
three atoms of oxygen (O).
moletronics See MOLECULAR ELECTRONICS.
mol wt Abbreviation of MOLECULAR WEIGHT.
molybdenum Symbol, Mo. A metallic element.
Atomic number, 42. Atomic weight, 95.94. It is
used in the grids and plates of certain vacuum
tubes.
moment
The tendency to produce motion around
a point, as by torque, or the product of a quantity
and the distance to a point. The moment of force
is expressed as the product Fd, where F is force
and d is distance.
momentary-contact switch A switch that maintains
contact only while it is held down. Such a
device is usually a pushbutton switch, although it
might be a toggle switch, a slide switch, or a lever
switch.
momentary switching Switching of short duration,
often characterized by a quick make and
break immediately following activation of the
switch. Compare DWELL SWITCHING.
moment of inertia For a torque motor, the inertia
of the armature around the axis of rotation. Also
see MOMENT.
mon 1. Abbreviation of MONITOR. 2. Abbreviation
of MONAURAL.
monatomic 1. Pertaining to a molecule with only
one atom. 2. Pertaining to a molecule with only
one replaceable atom or radical.
monatomic molecule A molecule having a single
atom (e.g., argon, helium, and neon). Compare
DIATOMIC MOLECULE.
monaural 1. Pertaining to an audio system having
one channel. 2. Pertaining to hearing with one
ear, as opposed to BINAURAL.
monaural recorder A single-track recorder, as opposed
to a stereophonic recorder.
Monel metal An alloy of nickel (67%), copper
(28%), iron, manganese, and other metals (5%).
Its resistivity is approximately 42 microhmcentimeters
at 20°C.
monimatch An amateur version of the reflectedpower
meter and SWR meter.
RF
input
V
monimatch
RF
output
moniscope A special cathode-ray tube that produces
a stationary picture for testing television
equipment. Its name is a contraction of monitor
and scope.
monitor 1. A device that allows the sampling of a
signal or quantity. Examples: line-voltage monitor,
television monitor, and modulation monitor. 2. A
cathode-ray-tube (CRT) computer display.
monitor head A separate playback head included
in some tape recorders for listening to the tape as
it is being recorded.
monitoring The act, process, or technique of observing
an action while it is in progress or checking
a quantity while it is varying. Examples:
carrier monitoring, modulation monitoring, and
line-voltage monitoring.
monitoring amplifier An auxiliary amplifier used
in monitoring an audio-frequency system.
monitoring antenna A usually small pickup antenna
used with a signal monitor or monitoring
receiver.
monitoring key In a telephone system, a device
used to listen to a two-way conversation.
monitoring receiver A radio or television receiver
used specifically to monitor a transmission directly.
monitoring station In a security system, a central
control location from which personnel can observe
the input from sensors, cameras, and other
devices at remote locations throughout the secured
area.
monitor system A computer program usually
stored in the read-only memory (ROM) supplied
by the hardware vendor. It controls the implementation
of programs written by the user, and
the operation of peripherals associated with