• Maintenance-free battery: A rechargeable battery which does not require periodic 'topping up' (addition of water) to maintain electrolyte volume. See also sealed battery.

  • Mass transport: The phenomenon of movement (transportation) of mass (e.g., chemical compounds, ions) from one part of the system to another. Most of the time this occurs through diffusion and convection. Under special circumstances it can also occur through electromigration since the movement of the electrically charged ions also carries mass with them (e.g., ionic current through an ion-exchange membrane. The mass transport and the charge transport are typically 'decoupled' in electrochemistry; that is, the reacting species and the charge carrying species are not necessarily identical. E.g., one would intuitively assume that during electroplating of copper from a solution of copper sulfate all the mass and charge required for the electrode reaction at the cathode would be carried by the copper cations in the solution. That is not the case at all. In the presence of a large excess of supporting electrolyte, all the current is carried by electromigration of the ions of the supporting electrolyte (both in the bulk solution and in the diffusion layer) while all the mass is carried by the copper ions by convection in the bulk solution and by diffusion in the diffusion layer. In the absence of any supporting electrolyte, all the mass is still carried by the copper ions, while the current is divided between the copper cations and the sulfate anions according to the ratio of their transport numbers (both in the bulk electrolyte and in the diffusion layer). The situation is maybe more self-explanatory in the case of an electrically neutral molecule reactant that cannot carry any current.

  • Mass-transport overpotential (polarization): See concentration overpotential.

  • Measuring electrode: See working electrode.

  • Mediated reaction: See indirect electrolysis.

  • Mediator: See indirect electrolysis.

  • Meg or mega: When used as a prefix before a unit name it indicates a multiplier of 106. E.g., megohm = 106 ohm, one million ohms. Symbol: 'M'.

  • Megohm: 106 ohm, symbol: 'MΩ' (one million ohms). (The symbol is the letter 'M' followed by the 'Greek capital omega' letter, some browsers unfortunately do not support this.)

  • Membrane: See separator.

  • Membrane electrode: An ion-selective electrode assembly terminating in an ion permeable (e.g., ion-exchange) membrane sensing element. The membrane separates the internal filling solution (that contains a fixed concentration of the ion to be detected) and the test solution. The potential across the membrane depends on the concentration ratio of the ion in the two solutions. The assembly also contains an internal reference electrode immersed in the filling solution, serving as an electrical contact with a stable potential. The potential of this assembly is then measured against an external reference electrode immersed in the test solution. See also Donnan potential.

  • Membrane potential: See Donnan potential.

  • Metal deposition/dissolution: A class of electrode reactions involving oxidation/reduction of a solid metal and its dissolved ion, e.g., if a copper metal rod is immersed in a copper sulfate solution, the copper cations can be cathodically reduced to copper metal, or the copper metal can be anodically oxidized to copper ions. Compare with a redox reaction where both the oxidized and the reduced species are in solution. The terms 'electrodeposition' and 'electrodissolution' are often used to describe these reactions. These reactions are used in many technologies, such as electroplating, electrowinning, and electrorefining. And also in electrogravimetry.

  • Metal displacement reaction: See cementation.

  • Metal plating: See electroplating.

  • Metal refining: See electrorefining.

  • mho: Alternative name of siemens.

  • micro: When used as a prefix before a unit name it indicates a multiplier of 10-6. E.g., microvolt = 10-6 volt, one millionth of a volt. Symbol: 'µ'.

  • microampere: 10-6 ampere, symbol: 'μA' (one millionth of an ampere).

  • microelectrode: A small electrode, with dimensions not larger than a few millimeters, and typically with dimensions of a small fraction of a millimeter.

  • microvolt: 10-6 volt, symbol: 'μV' (one millionth of a volt).

  • Migration: See electromigration.

  • milli: When used as a prefix before a unit name it indicates a multiplier of 10-3. E.g., millivolt = 10-3 volt, one thousandth of a volt. Symbol: 'm'.

  • milliampere: 10-3 ampere, symbol: 'mA' (one thousandth of an ampere).

  • millivolt: 10-3 volt, symbol: 'mV' (one thousandth of a volt).

  • Mixed potential: The electrode potential when two electrode reactions occur on the same electrode surface. The mixed potential has a value in between the equilibrium potentials of the two electrode reactions. The mixed potential is a steady-state phenomena, with the corrosion potential being a good example.

  • MΩ: Symbol and abbreviation of megohm (= 106 ohm, one million ohms). (The symbol is the letter 'M' followed by the 'Greek capital omega' letter, some browsers unfortunately do not support this.)

  • Mobility, ionic: See ionic mobility.

  • mol: The measurement unit and symbol of mole.

  • mole: See gram-mole.

  • Molar concentration: See concentration.

  • Molarity: See concentration.

  • Molecular weight: The weight of a molecule of a compound that may be calculated as the sum of the atomic weights of its constituent atoms.

  • Molecule: The smallest physical unit of a substance that retains all the physical and chemical properties of that substance. It may consist of a single atom or of a group of atoms bonded together chemically.

  • Molten-carbonate fuel cell: A fuel cell that employs a molten, ionically conductive salt (carbonate) as electrolyte. Due to the high melting point of these salts, these fuel cells must operate at high temperatures.

  • Multimeter: Instrument that can be used for the measurement of more than one parameter. Typically, it can be used to measure current, potential, and resistance.

  • mV: Symbol and abbreviation of millivolt (= 10-3 volt, one thousandth of a volt).

  • μV: Symbol and abbreviation of microvolt (= 10-6 volt, one millionth of a volt).

  • ››Convert millivolt to microvolt

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    ››More information from the unit converter

    How many millivolt in 1 microvolt?The answer is 0.001.
    We assume you are converting between millivolt and microvolt.
    You can view more details on each measurement unit:
    millivolt ormicrovolt
    The SI derived unit for voltage is the volt.
    1 volt is equal to 1000 millivolt, or 1000000 microvolt.
    Note that rounding errors may occur, so always check the results.
    Use this page to learn how to convert between millivolts and microvolts.
    Type in your own numbers in the form to convert the units!

    ››Quick conversion chart of millivolt to microvolt

    1 millivolt to microvolt = 1000 microvolt
    2 millivolt to microvolt = 2000 microvolt
    3 millivolt to microvolt = 3000 microvolt
    4 millivolt to microvolt = 4000 microvolt
    5 millivolt to microvolt = 5000 microvolt
    6 millivolt to microvolt = 6000 microvolt
    7 millivolt to microvolt = 7000 microvolt
    8 millivolt to microvolt = 8000 microvolt
    Microvolts Abbreviation
    9 millivolt to microvolt = 9000 microvolt
    10 millivolt to microvolt = 10000 microvolt

    ››Want other units?

    You can do the reverse unit conversion frommicrovolt to millivolt, or enter any two units below:

    ››Common voltage conversions

    millivolt to attovolt
    millivolt to kilovolt
    millivolt to zeptovolt
    millivolt to yottavolt
    millivolt to yoctovolt
    millivolt to zettavolt
    millivolt to exavolt
    millivolt to picovolt
    millivolt to decavolt
    millivolt to nanovolt
    Microvolts

    ››Definition: Millivolt

    The SI prefix 'milli' represents a factor of10-3, or in exponential notation, 1E-3.
    So 1 millivolt = 10-3 volts.
    The definition of a volt is as follows:
    The volt (symbol: V) is the SI derived unit of electric potential difference or electromotive force, commonly known as voltage. It is named in honor of the Lombard physicist Alessandro Volta (1745–1827), who invented the voltaic pile, the first chemical battery.
    The volt is defined as the potential difference across a conductor when a current of one ampere dissipates one watt of power.[3] Hence, it is the base SI representation m2 · kg · s-3 · A-1, which can be equally represented as one joule of energy per coulomb of charge, J/C.

    ››Definition: Microvolt

    The SI prefix 'micro' represents a factor of10-6, or in exponential notation, 1E-6.
    So 1 microvolt = 10-6 volts.
    The definition of a volt is as follows:
    The volt (symbol: V) is the SI derived unit of electric potential difference or electromotive force, commonly known as voltage. It is named in honor of the Lombard physicist Alessandro Volta (1745–1827), who invented the voltaic pile, the first chemical battery.
    The volt is defined as the potential difference across a conductor when a current of one ampere dissipates one watt of power.[3] Hence, it is the base SI representation m2 · kg · s-3 · A-1, which can be equally represented as one joule of energy per coulomb of charge, J/C.

    ››Metric conversions and more

    ConvertUnits.com provides an onlineconversion calculator for all types of measurement units.You can find metric conversion tables for SI units, as wellas English units, currency, and other data. Type in unitsymbols, abbreviations, or full names for units of length,area, mass, pressure, and other types. Examples include mm,inch, 100 kg, US fluid ounce, 6'3', 10 stone 4, cubic cm,metres squared, grams, moles, feet per second, and many more!