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Optics

Michelson Interferometer

An optical instrument that splits a beam of light into two perpendicular paths and recombines them to create high-precision interference…

2 d = m λ m
Foundations of Physics

Micrometer Screw Gauge

An ultra-precise measuring tool that uses a calibrated screw thread mechanism to measure microscopic thicknesses or diameters.

Reading = Main Scale + (Circular Scale Division × Least Count) mm
Thermodynamics & Statistical Physics

Microstate

A specific detailed microscopic configuration of a thermodynamic system, specifying exact positions and momenta of all constituent…

S = kB ln Ω N/A
Geophysics & Environmental Physics

Milankovitch Cycles

Cyclical variations in Earth's orbital eccentricity, axial tilt (obliquity), and precession that alter the seasonal and latitudinal…

Eccentricity (100ky), Obliquity (41ky), Precession (23ky) Geologic Climate Cycles (Years)
Condensed Matter & Materials Physics

Miller Indices

A standardized three-integer crystallographic notation system (h k l) used to specify direction vectors and orientation of planes in a…

(h k l) = Reciprocals of lattice axis intercepts Dimensionless Notation System
Optics

Minimum Deviation

The minimum value of deviation angle achieved when light passes symmetrically through a triangular prism.

n = sin[(A + δ_m)/2] / sin(A/2) Degrees (°)
Astrophysics, Cosmology & Relativity

Minkowski Space

The flat four-dimensional spacetime manifold combining 3D Euclidean space and time used to formulate Special Relativity.

ds² = -c² dt² + dx² + dy² + dz² Flat 4D Spacetime Metric
Optics

Mirage

An optical illusion caused by continuous refraction of light rays passing through air layers with steep temperature and density gradients.

n(z) = f(Temperature gradient) N/A
Thermodynamics & Statistical Physics

Molar Heat Capacity

The heat energy required to raise the temperature of one mole of a substance by one Kelvin.

C_m = Q / (n ΔT), C_p - C_v = R J/(mol·K)
Foundations of Physics

Mole

The SI base unit for amount of substance, containing exactly 6.02214076 × 10²³ elementary entities.

n = m / M = N / Na mol
Mathematical & Computational Physics

Molecular Dynamics

A computer simulation method for analyzing the physical movements of atoms and molecules by numerically integrating Newton's equations of…

m_i d²r_i/dt² = F_i = -∇_i V(r₁, r₂, ..., r_N) Atomic Trajectory Simulation
Biophysics & Medical Physics

Molecular Motors

Protein-based molecular machines that convert chemical energy from ATP hydrolysis into mechanical work and linear movement.

F_step ≈ 6 pN, Step Size d ≈ 8 nm (Kinesin on Microtubule) pN (Piconewtons) & nm (Step Length)
Classical Mechanics

Moment of Inertia

A quantitative measure of a body's rotational inertia - its resistance to changes in rotational motion about a given axis.

I = ∑ m_i r_i² = ∫ r² dm kg·m²
Classical Mechanics

Momentum

A fundamental vector quantity equal to the product of an object's mass and its velocity, representing its quantity of motion.

p = m v kg·m/s
Mathematical & Computational Physics

Monte Carlo Method

A class of computational algorithms that rely on repeated random sampling to obtain numerical solutions for complex physical systems.

I ≈ (1 / N) ∑_(i=1)^(N) f(X_i) (Central Limit Theorem) Stochastic Numerical Method
Quantum & Atomic Physics

Moseley's Law

An empirical law establishing a linear relationship between the square root of characteristic X-ray frequency emitted by an atom and its…

√ν = A (Z - b) Hz^(1/2) (Frequency Square Root)
Electromagnetism & Electronics

MOSFET

A Metal-Oxide-Semiconductor Field-Effect Transistor that uses an insulated gate voltage to control current flow through an underlying…

I_D = ½ μ_n C_ox (W/L) (V_GS - V_th)² A (Current)
Thermodynamics & Statistical Physics

Most Probable Speed

The particle speed corresponding to the maximum peak of the Maxwell-Boltzmann speed distribution curve.

v_mp = √(2 kB T / m) = √(2 R T / M) m/s
Electromagnetism & Electronics

Moving Coil Galvanometer, Ammeter & Voltmeter

An electromechanical instrument that measures small currents using magnetic torque on a pivoted coil, converted to an ammeter or voltmeter…

τ = N I A B = k θ; Ammeter: S = I_g G / (I - I_g); Voltmeter: R_s = (V / I_g) - G A (Current), V (Voltage)
Astrophysics, Cosmology & Relativity

Multiverse

A hypothetical set of multiple co-existing universes that together comprise all of physical reality.

Cosmic Inflation Bubble Universes & Many-Worlds Everett Branching Cosmological Hypothesis
Nuclear & Particle Physics

Muon

A second-generation elementary charged lepton with a mass approximately 207 times greater than an electron.

m_μ ≈ 105.66 MeV/c², τ_μ ≈ 2.2 μs, Spin = ½ MeV/c² (Mass Energy)
Electromagnetism & Electronics

Mutual Inductance

The induction of an electromotive force in a secondary circuit loop caused by a time-varying current in an adjacent primary circuit loop.

E₂ = -M (dI₁/dt), M = k √(L₁ L₂) H (Henries)