Previous Page...   Printer Version Science Constants - Dirac's Constant Symbol: ħ (h bar) Value: 1.054571596(82) × 10-34 J s 6.58211889(26) × 10-16 eV s Category: - Universal Constants Description: Dirac's constant is defined as h/2π, where h is Planck's constant.   [ H O M E ] [ S C I E N C E ] [ M A T H S ] [ A S T R O N O M Y ] [ Download ] [ Shop ] [ Contact ] [ About ]