Molybdenum is a lustrous, silvery coloured metal that resembles tungsten with which it tends to be paired in the transition series in the periodic table.
The ratio of the carrier velocity to the applied electric field.
A full-sized replica or dummy of something.
Chemical formula for Molybdenum II Chloride.
Chemical formula for Molybdenum IV Chloride.
Modal Analysis
The process of determining a set of generalized coordinates for a system such that the equations of motion are both inertially and elastically uncoupled.
Communication protocol developed by Modicon; widely used in SCADA and process control applications.
The most frequently occurring value in a sequence of numbers.
Mode Coupling
Energy exchange between modes of light propagating in an optical fibre.
Mode Shape
The relative position of all points on a structure at a given natural frequency.
A copy of an object that is n times smaller than the fullsize object.
Model Engineering
Lists all Model Engineering topics in the Encyclopaedia
Model Engineering Weblinks
Lists all Model Engineering Weblinks in the Encyclopaedia
Model Engineers Thread
A thread based upon the Whitworth thread form that was established in 1912.
Open modelling language that supports expression=expression rather than just variable=expression
A simplification of the real-life object and situation that preserves their essential nature, and allows a solution using mathematics.
A device whose name combines the term modulate with demodulate which refers to its ability to transmit and receive data superimposed on a carrier frequency.
A material used to slow down the neutrons in a nuclear reactor.
Modular Arithmetic
This is can be used as method for finding remainders where all the possible numbers (the numbers less than the divisor) are put in a circle, and then by counting around the circle the number of times of the number being divided, the remainder will be the final number landed on.
Modular Number System
A number system represented best by numbers on a circle because the numbers repeat.
Modulated Wave
A complex wave consisting of a carrier and a modulating wave.
Modulating Valve
A valve which can be positioned anywhere between fully on and fully off to proportion the rate of flow in response to a modulating controller.
The process, or the result of the process, by which a characteristic of one wave is varied according to some characteristic of another wave.
Modulation Factor
The ratio of the peak variation of the envelope from its reference value, to the reference value.
Modulation Index
In frequency modulation with a sinusoidal modulating wave, the ratio of the frequency deviation of the modulated wave to the frequency of the modulating function.
A device that produces modulation.
The measurement that architects use to determine the proportions of a structure, for example, the diameter of a column.
The integers a and b are said to be congruent modulo m if a-b is divisible by m.
The absolute value of a quantity, not considering it's sign or direction.
Modulus in Bending
Ratio of maximum fibre stress to maximum strain, within elastic limit of stress-strain diagram obtained in flexure test.
Modulus of Elasticity
The modulus of elasticity is the slope of the stress-strain diagram in the linear region.
Modulus of Elasticity in Shear
Another name for Shear Modulus.
Modulus of Rigidity
Another name for Shear Modulus.
Modulus of Rupture
Breaking strength in a non-ductile solid as measured by bending.
Modulus of Strain Hardening
Rate of change of true stress as a function of true strain in a material undergoing plastic deformation.
Modulus of Toughness
The work done on a unit volume of material as a simple tensile force is gradually increased from zero to the value causing rupture.
Chemical formula for Molybdenum Hexafluoride.
Mohl, Hugo von
Botanist who found that plant cells were composed of a living substance and used the term protoplasm much as we do today.
A hardness scale developed by F. Mohs in 1812 where the hardness of a material is compared with that of a mineral.
Mohs, Friederich
German geologist and inveenter of the hardness scale named after him.
Moire Fringes
A pattern formed by the interference between two regular sets of divisions.
Abbreviation of Mole, the SI unit of Amount of Substance.
Concentration measured as moles of solute per kilogram of solvent.
Pertaining to moles or a synonym for molarity.
Molar Flow Rate
The number of moles per unit time moving through a process.
Molar Gas Constant
R = 8.31441 JK-1mol-1
Molar Heat Capacity
The amount of heat required to raise the temperature of 1mol of a substance through 1K.
Molar Heat of Combustion
The amount of energy released in burning completely one mole of substance.
Molar Mass
The mass of one mole of a material.
Molar Volume
The volume occupied by one mole of a substance under specified conditions.
Concentration of a solution measured as the number of moles of solute per litre of solution.
The SI unit of the Amount of Substance. It is the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12.
Mole Fraction
The number of moles of a particular substance expressed as a fraction of the total number of moles.
Mole Grips
A type of pliers with locking jaws that can be used as pliers, wrench, clamp, or small vice.
Molecular Equation
A molecular equation is a balanced chemical equation in which ionic compounds are written as neutral formulas rather than as ions.
Molecular Formula
Shows the number of atoms of each element present in a molecule.
Molecular Geometry
Shape of a molecule, based on the relative positions of the atoms.
Molecular Orbital
A wavefunction that describes the behaviour of an electron in a molecule.
Molecular Sieve
A material that contains many small cavities interconnected with pores of precisely uniform size.
Molecular Slip
The existence of a finite net gas velocity at the surface of very small particles resulting in a lower drag force.
Molecular Weight
The combined weight (as given on the periodic table) of all the elements in a compound.
Molecularity of a Reaction
The number of species forming the transition state.
The smallest part of an element or of a covalently bonded compound that can exist independently and still retain the ordinary chemical properties of that element or compound.
Molten Carbonate Fuel Cells
Carbonate salts are the electrolyte. Heated to 650deg;C, the salts melt and conduct carbonate ions (CO3) from the cathode to the anode.
A compound containing an oxoanion with molybdenum in its highest oxidation state of 6.
A lustrous, silvery coloured metal that resembles tungsten with which it tends to be paired in the transition series in the periodic table.
Molybdenum Dichloride
Alternative name for Molybdenum II Chloride.
Molybdenum Dioxide
Alternative name for Molybdenum IV Oxide.
Molybdenum Disilicide


A refractory ceramic with primary use in heating elements.

Molybdenum Disulphide


The appearance and feel of molybdenum disulphide is similar to graphite. As per graphite, it is widely used as a solid lubricant because of its low friction properties, sometimes to relatively high temperatures.

Molybdenum Hexacarbonyl


A colourless solid noteworthy as a volatile, air-stable derivative of a metal in its zero oxidation state. Used in electron beam-induced deposition techniques.

Molybdenum Hexafluoride


A solid which melts just below room temperature and hydrolyses in water to give hydrofluoric acid.

Molybdenum II Chloride


Attracts attention from researchers because of the unexpected structures seen for these compounds and the fact that they give rise to hundreds of derivatives.

Molybdenum IV Chloride


Black solid inorganic compound.

Molybdenum IV Oxide


Violet coloured solid that is a metallic conductor.

Molybdenum Pentachloride
Alternative name for Molybdenum V Chloride.
Molybdenum Tetrachloride
Alternative name for Molybdenum IV Chloride.
Molybdenum Trioxide


Used as an oxidation catalyst and as a raw material for the production of molybdenum metal.

Molybdenum V Chloride


Dark volatile solid is an important starting reagent in the preparation of molybdenum compounds.

Molybdic Anhydride
Alternative name for Molybdenum Trioxide.
Moments of Inertia
Principal axes for bodies of uniform density.
Usually refers to linear momentum, a vector quantity equal to the product of an object's mass and its velocity.
Monatomic Ion
An ion formed from a single atom by the loss or gain of electrons.
Strong and corrosion resistant. Applications include: turbine blades, propellers, pump fittings, ...
Monic Polynomial
A polynomial in which the coefficient of the term of highest degree is 1.
Alternative name for Bromomethane.
Alternative name for Chloroethane.
Radiation that has a single wavelength.
A type of construction in which all or most of the stresses are carried by the skin.
Monocrystalline Solar Cell
More expenive to make as the crystals are grown under carefully controlled conditions.
A ligand that has only one atom that coordinates directly to the central atom in a complex.
A volcano built by a single eruption.
Alternative name for Germane.
An object that is one piece and not composed of several pieces connected together.
Monolithic Circuit
A circuit where all elements associated with the circuit are fabricated inseparably within a continuous piece of material.
Monolithic Dome
A dome composed of a series of arches, joined together with a series of horizontal rings called parallels.
A molecule that, under the correct conditions, can link together with others to form larger molecules called polymers.
An algebraic expression consisting of just one term.
Single-channel sound.
An aircraft with one set of wings.
A single rail train system.
A single pressed side of a vehicle body.
Alternative name for Silane.
Monosodium Glutamate


A sodium salt of glutamic acid, a naturally occurring non-essential amino acid.

Circuit with two states. Only one state is stable.
A sequence is monotone if its terms are increasing or decreasing.
Designating sequences, the successive members of which either consistently increase or decrease but do not oscillate in relative value.
Monotube Shock Absorber
A common type of shock absorber with the working cylinder and reservoir contained in one tube.
Monte Carlo Calculations
Simulation based upon events that happen randomly, and so the outcome of a calculation is not always absolutely predictable.
Montgolfier, Jacques Etienne
Jacques and brother Joseph made the first successful hot-air balloon flight in 1782.
Montgolfier, Joseph
Joseph and brother Jacques made the first successful hot-air balloon flight in 1782.
A sequence is monotone if its terms are all increasing or all decreasing.
Another name for Mercury II Oxide.
Chemical formula for Molybdenum IV Oxide.
Chemical formula for Molybdenum Trioxide.
Basic Moon data.
Moore′s Law
This states that the number of devices on a silicon chip could double each year.
Morgan, Thomas Hunt
Biologist and Nobel Prize winner who contributed to the knowledge of the mechanism of heredity.
Mormon Clamp
A term applied to a clamp installed around a cylindrical object to connect two halves together.
Morning Star
Name given to Venus when observed in the morning, also known as Hosperus.
Morse Code
The International Morse Code used to transmit signals by wire or by radio using short and long duration signals.
Morse Taper
A self-holding standard taper largely used on small cutting tools.
A cavity or hole cut to allow a tennon to pass through to make a joint.
Chemical formula for Molybdenum Disulphide.
Moseley, Henry Gwyn-Jeffreys
English physicist who demonstrated that the number of electrons in an element is the same as the atomic number, establishing the significance of the atomic number.
In a MOSFET device the gate is insulated from the channel by a very thin (typically less than the wavelength of light) layer of glass (silicon dioxide) and the gate is either metal or doped silicon (polysilicon), hence the acronym metal-oxide semiconductor.
Chemical formula for Molybdenum Disilicide.
Abbreviation of milliosmole.
Mossbauer Spectrometer
An instrument that provides information on the bonding of an atom in a mineral by bombarding it with gamma rays.
Most Significant Bit (MSB)
The bit within a digital word that represents the biggest possible single-bit coded value.
Mother Liquor
The solution in recrystallization.
The main circuit board of a PC to which everything connects.
Motion Sickness
Defined specifically to describe nausea, vomiting and colour changes. It does not include discomfort.
Motive Power
A natural agent, as water, steam, wind, electricity, etc., used to impart motion to machinery; a motor; a mover.
A mechanism doing work by means of a ready source of energy, such as electric current, compressed air, or oil under pressure.
Motor Rule
Also known as Fleming′s Left Hand Rule, this is a way of determining the direction of a force on a current carrying conductor in a magnetic field.
The process of manufacturing by shaping pliable raw material using a rigid frame or model called a pattern.
A unit of mass, equal to 25 grams.
A device used to move a pointer around on the computer screen.
Movable Bridge
A bridge in which the deck moves to clear a navigation channel.
Moving Average
The average of the most recent n data values.
Moving Ground Plane Wind Tunnel
A wind tunnel with a system that allows the floor to be moved relative to the test object and matched in speed to the bulk air flow.
Moving Picture Experts Group
A working group within SMPTE who set, among other things, specifications for compression schemes for audio and video transmission.
Moving Pictures Experts Group
A working group within SMPTE who set, among other things, specifications for compression schemes for audio and video transmission.
Moving Vane Meter Movement
A meter movement that uses the magnetic repulsion of the like poles created in two iron vanes by current through a coil of wire.