Mo

Mo: 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.
Mobility: The ratio of the carrier velocity to the applied electric field.
Mockup: A full-sized replica or dummy of something.
MoCl₂: Chemical formula for Molybdenum II Chloride.
MoCl₄: 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.
MODbus: Communication protocol developed by Modicon; widely used in SCADA and process control applications.
Mode: 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.
Model: 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.
Modelica: Open modelling language that supports expression=expression rather than just variable=expression
Modeling: A simplification of the real-life object and situation that preserves their essential nature, and allows a solution using mathematics.
Modem: 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.
Moderator: 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.
Modulation: 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.
Modulator: A device that produces modulation.
Module: The measurement that architects use to determine the proportions of a structure, for example, the diameter of a column.
Modulo: The integers a and b are said to be congruent modulo m if a-b is divisible by m.
Modulus: 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.
MoF₆: 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.
Mohs: 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.
mol: Abbreviation of Mole, the SI unit of Amount of Substance.
Molality: Concentration measured as moles of solute per kilogram of solvent.
Molar: 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.
Molarity: Concentration of a solution measured as the number of moles of solute per litre of solution.
Mole: 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.
Molecule: 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.
Molybdate: A compound containing an oxoanion with molybdenum in its highest oxidation state of 6.
Molybdenum: 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: MoSi₂
A refractory ceramic with primary use in heating elements.
Molybdenum Disulphide: MoS₂
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: C₆O₆Mo
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: MoF₆
A solid which melts just below room temperature and hydrolyses in water to give hydrofluoric acid.
Molybdenum II Chloride: MoCl₂
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: MoCl₄
Black solid inorganic compound.
Molybdenum IV Oxide: MoO₂
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: MoO₃
Used as an oxidation catalyst and as a raw material for the production of molybdenum metal.
Molybdenum V Chloride: Cl₁₀Mo₂
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.
Momentum: 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.
Monel: 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.
Monobromomethane: Alternative name for Bromomethane.
Monochloroethane: Alternative name for Chloroethane.
Monochromatic: Radiation that has a single wavelength.
Monocoque: 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.
Monodentate: A ligand that has only one atom that coordinates directly to the central atom in a complex.
Monogenetic: A volcano built by a single eruption.
Monogermane: Alternative name for Germane.
Monolithic: 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.
Monomer: A molecule that, under the correct conditions, can link together with others to form larger molecules called polymers.
Monomial: An algebraic expression consisting of just one term.
Monophonic: Single-channel sound.
Monoplane: An aircraft with one set of wings.
Monorail: A single rail train system.
Monoside: A single pressed side of a vehicle body.
Monosilane: Alternative name for Silane.
Monosodium Glutamate: C₅H₈NNaO₄
A sodium salt of glutamic acid, a naturally occurring non-essential amino acid.
Monostable: Circuit with two states. Only one state is stable.
Monotone: A sequence is monotone if its terms are increasing or decreasing.
Monotonic: 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.
Montone: A sequence is monotone if its terms are all increasing or all decreasing.
Montroydite: Another name for Mercury II Oxide.
MoO₂: Chemical formula for Molybdenum IV Oxide.
MoO₃: Chemical formula for Molybdenum Trioxide.
Moon: 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.
Mortise: A cavity or hole cut to allow a tennon to pass through to make a joint.
MoS₂: 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.
MOSFET: 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.
MoSi₂: Chemical formula for Molybdenum Disilicide.
mOsm: 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.
MotherBoard: 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.
Motor: 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.
Moulding: The process of manufacturing by shaping pliable raw material using a rigid frame or model called a pattern.
mounce: A unit of mass, equal to 25 grams.
Mouse: 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.

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