Quantum of Circulation

The quantum of angular momentum per unit electron mass, half of it the basic vorticity step.

Specifications & Metrics

symbol

h/2me

status

Measured — CODATA 2022 adjustment

value

3.6369475467 × 10⁻⁴ ± 1.1 × 10⁻¹³ m²·s⁻¹

Relative Scale in Constants

Core Principles & Analysis

• 3.636 9 × 10⁻⁴ m²/s, exactly h over twice the electron mass.
• Superfluid vortices carry circulation in integer multiples of h over twice the particle mass.
• Measured in silicon, it joins h and the electron mass in one experiment.