๐Ÿงชap chemistry review

Planck's Constant

Written by the Fiveable Content Team โ€ข Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 examโ€ขWritten by the Fiveable Content Team โ€ข Last updated September 2025

Definition

Planck's constant is a physical constant that is the quantum of electromagnetic action which relates the energy carried by a photon to its frequency. Its symbol is h and it has a value of 6.62607015 ร— 10^-34 m^2 kg / s.