Physical quantities which are constant and have no units.
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more than 3 weeks ago
1. Mathematical constants such as π (pi) and e (Euler's number) 2. Universal constants such as the speed of light in vacuum (c) and the gravitational constant (G) 3. Planck's constant (h) 4. Avogadro's number (N_A) 5. Boltzmann's constant (k) 6. Electron charge (e) 7. Fine structure constant (α) 8. Permittivity of free space (ε_0) 9. Permeability of free space (μ_0) 10. Stefan-Boltzmann constant (σ)