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Terms starting with M

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Waves, Oscillations & Acoustics

Mach Number

A dimensionless speed ratio equal to the speed of an object or fluid divided by local speed of sound in the surrounding medium.

M = v / v_sound Dimensionless Mathematical & Computational Physics

Machine Learning in Physics

The application of artificial intelligence, neural networks, and statistical learning models to solve complex physical equations and…

Physics-Informed Neural Networks (PINN): Loss = L_data + λ L_physics Computational AI Framework Thermodynamics & Statistical Physics

Macrostate

The macroscopic state of a thermodynamic system defined by observable thermodynamic variables like pressure, volume, temperature, and total…

Defined by (P, V, T, N, U) N/A Plasma Physics

Magnetic Confinement

The trapping of high-temperature fusion plasma using intense magnetic fields that exert Lorentz forces to prevent plasma particles from…

β = p / (B² / (2 μ₀)) = 2 μ₀ n k_B T / B² Dimensionless Ratio (Plasma Beta β) Electromagnetism & Electronics

Magnetic Dipole

The basic magnetic structure created by a closed circulating current loop or intrinsic particle spin, possessing North and South magnetic…

μ = I A, τ = μ × B A·m² (or J/T) Electromagnetism & Electronics

Magnetic Dipole Moment

A vector quantity determining the torque experienced by a magnetic dipole when placed in an external magnetic field.

μ = I A, U = -μ · B A·m² (or J/T) Condensed Matter & Materials Physics

Magnetic Domains

Microscopic regions within a ferromagnetic material where atomic magnetic moments are aligned parallel in a uniform direction.

Domain Wall Energy E_total = E_exchange + E_anisotropy μm to mm (Domain Size) Electromagnetism & Electronics

Magnetic Field

A vector field generated by moving electric charges, electric currents, or intrinsic magnetic moments that exerts magnetic forces on other…

F_mag = q (v × B), B = μ₀ I / (2π r) T (Tesla = N/(A·m)) Electromagnetism & Electronics

Magnetic Flux

The measure of the total magnetic field passing normally through a specified surface area.

Φ_B = ∫ B · dA = |B| |A| cos θ Wb (Webers = T·m²) Plasma Physics

Magnetic Helicity & Taylor Relaxation

A topological invariant measuring the linking, twisting, and tangling of magnetic flux lines in a closed plasma volume.

K = ∭ A · B dV, ∇ × B = μ B (Taylor State) Wb² (Magnetic Helicity Units) Electromagnetism & Electronics

Magnetic Hysteresis

The lagging of magnetization behind the applied magnetizing field in ferromagnetic materials during cyclic magnetization.

Hysteresis Loss Area = ∫ H dB J/m³ (Joules per cubic meter) Plasma Physics

Magnetic Mirror

A magnetic confinement configuration where converging magnetic field lines reflect charged particles back toward regions of weaker magnetic…

Sin²(θ_loss) = B_min / B_max (Loss Cone Angle) Dimensionless Mirror Ratio B_max / B_min Electromagnetism & Electronics

Magnetic Permeability

A material property measuring the degree to which a medium supports and concentrates magnetic flux inside itself when subjected to a…

μ = B / H = μ_r μ₀, μ₀ = 4π × 10⁻⁷ T·m/A H/m (or T·m/A) Plasma Physics

Magnetic Reconnection

A fundamental plasma process where opposing magnetic field lines break and explosively reconnect, releasing stored magnetic field energy…

E_reconnection ≈ M_A v_A B (Alfvénic Reconnection Rate) MW or Joules (Energy Conversion) Biophysics & Medical Physics

Magnetic Resonance Imaging (MRI)

A non-invasive medical imaging modality utilizing powerful magnetic fields, radiofrequency (RF) pulses, and nuclear magnetic resonance…

Larmor Frequency ν₀ = (γ / 2π) B₀ (γ_proton ≈ 42.58 MHz/T) Tesla B₀ (~1.5–3.0 T) & MHz Electromagnetism & Electronics

Magnetic Susceptibility

A dimensionless material property measuring the degree of magnetization induced in a material per unit applied magnetic field strength.

M = χ_m H, μ_r = 1 + χ_m Dimensionless Plasma Physics

Magnetized Target Fusion (MTF)

A hybrid fusion approach that combines magnetic confinement thermal insulation with rapid mechanical or laser inertial compression.

Hybrid MTF: Density n ~ 10²⁴ m⁻³, Confinement Time τ_E ~ 1 μs–1 ms Hybrid Density & Time Scale Biophysics & Medical Physics

Magnetoencephalography (MEG)

A non-invasive functional neuroimaging technique mapping brain activity by measuring weak magnetic fields produced by neuronal electric…

Magnetic Field B ~ 10–100 fT (10⁻¹⁵ Tesla) fT (Femtoteslas = 10⁻¹⁵ T) Plasma Physics

Magnetohydrodynamics

The fluid framework describing the macroscopic dynamics and magnetic field interactions of electrically conducting fluids and magnetized…

∂B / ∂t = ∇ × (v × B) + η ∇²B, ρ (dv/dt) = -∇p + J × B + ρ g MHD Equations Framework Geophysics & Environmental Physics

Magnetosphere

The region of space surrounding Earth dominated by Earth's geomagnetic field, shielding the planet from harmful solar wind plasma.

Magnetopause Distance R_mp ≈ (B₀² / (2 μ₀ ρ v²))^(1/6) Earth Radii (R_E ~ 10 R_E sunward) Plasma Physics

Magnetron Sputtering

A physical vapor deposition (PVD) technique utilizing magnetically confined glow discharge plasma to sputter target material onto…

E × B Electron Trapping drift path near cathode target nm/s (Deposition Rate) Optics

Magnification

The ratio of image height to object height, or ratio of image distance to object distance in an optical system.

m = h_image / h_object = -v / u Dimensionless Astrophysics, Cosmology & Relativity

Main Sequence

The continuous evolutionary diagonal band on the Hertzsprung-Russell diagram containing stars fusing hydrogen into helium in their cores.

L ∝ M^3.5 (Mass-Luminosity Relation) H-R Diagram Band Condensed Matter & Materials Physics

Majority & Minority Carriers

The classification of charge carriers in a doped semiconductor based on their relative concentrations.

N-Type: n_majority = N_D, p_minority = n_i² / N_D cm⁻³ (Carrier Density)