An Etymological Dictionary of Astronomy and Astrophysics
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In nuclear physics, a constant that indicates a measure of how strongly two particles interact.

→ coupling; → constant.

Same as → fine-structure constant.

→ electromagnetic; → coupling; → constant.

The dimensionless gravitational constant defined as the gravitational attraction between pair of electrons and normally given by: α_G = (Gm_e²) / (ħc) = (m_e / m_P)² ~ 1.7518 × 10^-45, where ħ is → Planck's reduced constant, c the → speed of light, m_e is the → electron mass, and m_P is the → Planck mass.

→ gravitational; → coupling; → constant.