1 eV $\approx$ 11,600 K (thermal energy at "1 eV temperature") - 1 eV $\approx$ 8066 cm$^{-1}$ (spectroscopic wavenumber) - Room temperature ($T = 300$ K) $\approx$ 1/40 eV $\approx$ 25.9 meV - Visible light: 1.65 eV (red) to 3.1 eV (violet) - Hydrogen ground state: $-13.6$ eV $= -1$ Rydberg $= -0.5