Macromolecule

(n.) A very large molecule, typically created through polymerization.

Magnet

(n.) (from the Greek adamas meaning diamond) Material (natural iron oxide) or device that attracts particularly iron and its alloys. Magnets are used in compass needles, speakers, and car alternators. A magnet has two poles: a north and a south. Like electrical charges, two poles of the same name repel each other, and two poles of different names attract each other. By superimposing them in a suitable container, one can make one float in the air. This property is used by trains that operate by magnetic levitation and use superconducting materials as magnets.

Maillechort

(n.) (from the names of the inventors, Maillot and Chorier) An alloy of copper, nickel, and zinc, resembling silver.

Main Branch

(n.m.) Portion of a circuit with derivations that goes from one node to the next and contains the generator.

Mains Voltage

(n.) Voltage available at the terminals of a power outlet.

Manometer

(n.) A device that measures the pressure difference between a liquid or gas contained in a closed space and generally the air.

Mass

(n.) A physical quantity that can be measured with a balance. Its legal unit is the kilogram (kg).

Matter Diffusion

(n.) The transport phenomenon of matter between two or more zones of a liquid, solid, or gas where substances are present at different concentrations. It results in uniform concentration.

Matter Filter

(n.) A device that retains the solid constituents of a heterogeneous mixture during filtration.

Mechanical Energy

(n.) The sum of potential energy and kinetic energy. It can be transferred by a moving object.

Meniscus

(n.) The curve seen at the surface of a liquid in a narrow container.

Metal

(n.) A simple material with a particular shine known as metallic luster when polished. A metal is a good conductor of heat and electricity. All metals are solid at ordinary temperatures, except for mercury, which is liquid. They possess mechanical properties such as hardness, toughness, malleability, and ductility, which determine their many uses. The main metals are: gold, silver, platinum, mercury, copper, aluminum, iron, tin, lead, and zinc. Gold, silver, and platinum are precious metals.

Miscibility

(n.) The ability of two substances to form a homogeneous mixture.

Miscible

(adj.) Two liquids are said to be miscible when they form a homogeneous mixture.

Mixture

(n.) A substance that is the combination of several pure substances.

Molecule

(n.) A group of atoms bonded together.

Moon Phase

(n.f.) Aspect of the Moon as observed from Earth.

Multimeter

(n.) A measuring device that can be used as an ammeter, voltmeter, or ohmmeter to measure current intensity, electrical voltage, or resistance of a resistor, respectively.

Myopia

(n.) A defect of the eye that results in blurry vision of distant objects. It is corrected with a diverging lens.

Myopic

(adj.) Describes an eye that is too convergent. The vision of distant objects is blurry.