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| # | Thing | Description | Topic | For | Against | Net | |
|---|---|---|---|---|---|---|---|
| 601 |  | Mass–energy equivalence | Physics concept expressed as E = mc² | Physical sciences | 0 | 0 | 0 |
| 602 |  | Materials science | Research of materials | Physical sciences | 0 | 0 | 0 |
| 603 |  | Matter | Something that has mass and volume | Physical sciences | 0 | 0 | 0 |
| 604 |  | Maxwell's equations | Equations describing classical electromagnetism | Physical sciences | 0 | 0 | 0 |
| 605 |  | Meadow | Open habitat vegetated primarily by non-woody plants | Physical sciences | 0 | 0 | 0 |
| 606 |  | Meander | One of a series of curves in a channel of a matured stream | Physical sciences | 0 | 0 | 0 |
| 607 |  | Measurement | Process of assigning numbers to objects or events | Physical sciences | 0 | 0 | 0 |
| 608 |  | Mechanics | Science concerned with physical bodies subjected to forces or displacements | Physical sciences | 0 | 0 | 0 |
| 609 |  | Medicinal chemistry | Scientific branch of chemistry | Physical sciences | 0 | 0 | 0 |
| 610 |  | Melting | Material phase change | Physical sciences | 0 | 0 | 0 |
| 611 |  | Mercury (element) | Chemical element with atomic number 80 (Hg) | Physical sciences | 0 | 0 | 0 |
| 612 |  | Mercury (planet) | First planet from the Sun | Physical sciences | 0 | 0 | 0 |
| 613 |  | Mesa | Elevated area of land with a flat top and sides, usually much wider than buttes | Physical sciences | 0 | 0 | 0 |
| 614 |  | Meson | Subatomic particle; made of equal numbers of quarks and antiquarks | Physical sciences | 0 | 0 | 0 |
| 615 | Mesozoic | Second era of the Phanerozoic Eon | Physical sciences | 0 | 0 | 0 | |
| 616 |  | Messier 87 | Galaxy in the constellation Virgo | Physical sciences | 0 | 0 | 0 |
| 617 |  | Metal | Type of material | Physical sciences | 0 | 0 | 0 |
| 618 |  | Metallic bonding | Type of chemical bond in metals | Physical sciences | 0 | 0 | 0 |
| 619 |  | Metallicity | Relative abundance of heavy elements in a star or other astronomical object | Physical sciences | 0 | 0 | 0 |
| 620 |  | Metalloid | Chemical element with metallic and nonmetallic properties | Physical sciences | 0 | 0 | 0 |
| 621 |  | Metamaterial | Materials engineered to have properties that have not yet been found in nature | Physical sciences | 0 | 0 | 0 |
| 622 |  | Metamorphic rock | Rock that was subjected to heat and pressure | Physical sciences | 0 | 0 | 0 |
| 623 |  | Meteor shower | Celestial event caused by streams of meteoroids entering Earth's atmosphere | Physical sciences | 0 | 0 | 0 |
| 624 |  | Meteoroid | Sand- to boulder-sized particle of debris in the Solar System | Physical sciences | 0 | 0 | 0 |
| 625 |  | Meteorology | Scientific study of the atmosphere focusing on weather forecasting | Physical sciences | 0 | 0 | 0 |
| 626 |  | Methane | Hydrocarbon compound (CH4) in natural gas | Physical sciences | 0 | 0 | 0 |
| 627 |  | Methanol | CH3OH; simplest possible alcohol | Physical sciences | 0 | 0 | 0 |
| 628 | Methodology | Study of research methods | Physical sciences | 0 | 0 | 0 | |
| 629 |  | Metre | SI unit of length | Physical sciences | 0 | 0 | 0 |
| 630 | | Metric system | Decimal-based systems of measurement | Physical sciences | 0 | 0 | 0 |
| 631 |  | Metrology | Science of measurement and its application | Physical sciences | 0 | 0 | 0 |
| 632 |  | Mica | Group of phyllosilicate minerals | Physical sciences | 0 | 0 | 0 |
| 633 |  | Michelson–Morley experiment | 1887 investigation of the speed of light | Physical sciences | 0 | 0 | 0 |
| 634 |  | Microwave | Electromagnetic radiation with wavelengths from 1 m to 1 mm | Physical sciences | 0 | 0 | 0 |
| 635 |  | Mid-ocean ridge | Basaltic underwater mountain system formed by plate tectonic spreading | Physical sciences | 0 | 0 | 0 |
| 636 |  | Mile | Unit of length | Physical sciences | 0 | 0 | 0 |
| 637 |  | Milky Way | Galaxy containing the Solar System | Physical sciences | 0 | 0 | 0 |
| 638 |  | Mineral | Crystalline chemical element or compound formed by geologic processes | Physical sciences | 0 | 0 | 0 |
| 639 |  | Mineralogy | Scientific study of minerals and mineralised artifacts | Physical sciences | 0 | 0 | 0 |
| 640 |  | Minute | Unit of time equal to 60 seconds | Physical sciences | 0 | 0 | 0 |
| 641 |  | Mirage | Optical illusion caused by bending of light | Physical sciences | 0 | 0 | 0 |
| 642 | Mixture | Substance formed when two or more constituents are physically combined | Physical sciences | 0 | 0 | 0 | |
| 643 |  | Mole (unit) | SI unit of amount of substance | Physical sciences | 0 | 0 | 0 |
| 644 |  | Molecular cloud | Type of interstellar cloud | Physical sciences | 0 | 0 | 0 |
| 645 |  | Molecular orbital | Wave-like behavior of an electron in a molecule | Physical sciences | 0 | 0 | 0 |
| 646 | Molecular orbital theory | Method for describing the electronic structure of molecules using quantum mechanics | Physical sciences | 0 | 0 | 0 | |
| 647 |  | Molecule | Electrically neutral group of two or more atoms | Physical sciences | 0 | 0 | 0 |
| 648 |  | Molybdenum | Chemical element with atomic number 42 (Mo) | Physical sciences | 0 | 0 | 0 |
| 649 |  | Moment of inertia | Scalar measure of the rotational inertia with respect to a fixed axis of rotation | Physical sciences | 0 | 0 | 0 |
| 650 |  | Momentum | Property of a mass in motion | Physical sciences | 0 | 0 | 0 |
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