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The 101 pages that link to Angular momentum, each with the reason it gives.

• Accretion diskNarrower topic: Its conservation keeps infalling material orbiting rather than plunging directly into the central object.

• Electron spinNarrower topic: Spin is an intrinsic form of angular momentum, not orbital motion.

• GyroscopeNarrower topic: A spinning rotor's angular momentum gives it resistance to changes in its rotational axis.

• SpinNarrower topic: Spin is the intrinsic contribution to a system’s total angular momentum.

• Earth's axial tiltNarrower topic: Earth's spin and orbital motion preserve angular momentum while their orientations evolve.

• Nuclear spinNarrower topic: Nuclear spin is the intrinsic, quantized form of angular momentum.

• Optical pumpingNarrower topic: Angular-momentum conservation constrains how photons change atomic magnetic sublevels.

• Conservation of angular momentumNarrower topic: The conserved quantity whose value remains fixed when net external torque vanishes.

• Stellar rotationNarrower topic: A star’s spin is its angular momentum expressed through its mass distribution and rotation rate.

• Magnetic quantum numberNarrower topic: The magnetic quantum number labels an allowed component of angular momentum.

• Bohr magnetonNarrower topic: The magneton converts an angular-momentum scale into a magnetic-moment scale.

• Rotational spectroscopyNarrower topic: Molecular rotational states are quantized according to angular momentum.

• Millisecond pulsarNarrower topic: Accreted matter spins up the neutron star by transferring angular momentum.

• Nuclear magnetic momentNarrower topic: Nuclear magnetic moments are related to angular momentum through a gyromagnetic ratio.

• Orbital migrationNarrower topic: Exchanging angular momentum is a central way disks and companions change orbits.

• Pauli matricesNarrower topic: Spin components obey the same angular-momentum commutation relations represented by the matrices.

• Kepler's second lawNarrower topic: The Sun's gravitational force exerts no torque about the Sun, so orbital angular momentum stays constant.

• Landau–Yang theoremNarrower topic: Rotational symmetry restricts the total angular momentum available to a two-photon state.

• TetherballNarrower topic: Strikes change the ball’s rotational motion around the pole.

• Atomic and molecular processes in external fieldsNarrower topic: Angular momentum organizes the states that fields split and mix.

• Rotating black holeNarrower topic: It is the defining extra property distinguishing a rotating black hole from a nonrotating one.

• Spin-½Narrower topic: Spin is an intrinsic form of angular momentum, distinct from orbital motion.