Molar Planck Constant

The Planck constant counted out per mole, bridging quantum mechanics and chemical amounts.

Specifications & Metrics

symbol

NAh

status

Exact — exact via NA and h in the 2019 SI

value

3.990312712 × 10⁻¹⁰ J·Hz⁻¹·mol⁻¹

Relative Scale in Constants

Core Principles & Analysis

• Product of the Avogadro constant and the Planck constant.
• Basis of the old silicon-XRCD route to measuring Avogadro's number.
• Connects macroscopic thermodynamics to single-quantum behaviour.