18WuD2x

mixture • moderator 451
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diffusion of one substance throughout another,
without a solution or a chemical reaction resulting.
mixture melting point Abbreviation, mmp. The
temperature at which a mixture of solid substances
starts turning into a liquid at 1 atmosphere
of pressure. This melting point depends
upon the melting points of the substances and
their relative concentration in the mixture. Also
see MELTING POINT and MIXTURE.
mks Abbreviation of METER-KILOGRAM-SECOND.
mL Abbreviation of MILLILAMBERT.
ml Abbreviation of MILLILITER.
mm Abbreviation of MILLIMETER.
mmf Abbreviation of MAGNETOMOTIVE FORCE.
mmol Abbreviation of MILLIMOLE.
mmp Abbreviation of MIXTURE MELTING POINT.
mmv Abbreviation of MONOSTABLE MULTIVI-
BRATOR.
Mn Symbol for MANGANESE.
m n Symbol for MASS OF NEUTRON AT REST.
mnemonic 1. Pertaining to MEMORY or to memory
systems. 2. A memory code or device.
mnemonic code In computer operations, a programming
code, such as assembly language,
that, although easily remembered by the programmer,
requires subsequent conversion to machine
language.
mntr Abbreviation of MONITOR. (Also, mon.)
MO Abbreviation of MASTER OSCILLATOR.
Mo Symbol for MOLYBDENUM.
mobile communications 1. Radio communications
between or among stations on board moving
or stationary land, waterborne, or airborne
vehicles. 2. Radio communications between at
least one fixed station and one or more moving or
stationary land, waterborne, or airborne stations.
mobile radio service See MOBILE COMMUNICA-
TIONS.
mobile receiver A radio, television, or other receiver
aboard a moving or stationary land, waterborne,
or airborne vehicle.
mobile-relay station A fixed station that receives a
signal from a MOBILE STATION and retransmits
it to one or more other mobile stations.
mobile station A station installed and operated
aboard a moving or stationary vehicle. The vehicle
might be on land, under water, or in the air.
Compare PORTABLE STATION.
mobile transmitter A radio, television, or other
transmitter aboard a moving or stationary vehicle.
The vehicle might be on land, under water, or
in the air.
mobility See CARRIER MOBILITY.
mockup See DUMMY, 1.
mod 1. Abbreviation of MODULATOR. 2. Abbreviation
of MODULUS. 3. Abbreviation of MODIFICA-
TION.
mode 1. One of the ways a given resonant system
can oscillate. 2. One of the ways that electromagnetic
energy can be propagated through a device
or system. See MODES OF PROPAGATION.
3. The method via which intelligence is conveyed
in a communications or broadcast signal. See
EMISSION MODE. 4. Resonance of sound waves
within an acoustic chamber.
mode coupling The exchange or interaction of energy
between identical modes (see MODE, 1, 2).
mode filter A waveguide filter that separates
waves of different propagation mode, but of the
same frequency (see MODES OF PROPAGATION).
model 1. A working or mockup version of a circuit,
system, or device, illustrative of the final version.
2. A mathematical representation of a process,
device, circuit, or system. Example: the Rutherford
model of the atom.
modeling The creation of an object in three-dimensional
computer graphics.
modem See MODULATOR-DEMODULATOR.
mode purity In a modulated radio-frequency signal,
the condition in which no undesirable types
of modulation exist. For example, a frequencymodulated
signal in which there is zero amplitude
modulation.
moderator A substance, such as graphite or
heavy water, used to slow neutrons in an atomic
reactor. Also see ACCELERATOR, 1 and REAC-
TOR, 2.