Thermal de Broglie wavelength

In physics, the thermal de Broglie wavelength ( λ th {\displaystyle \lambda _{\text{th}}} , sometimes also denoted by Λ {\displaystyle \Lambda } ) is a measure of the uncertainty in location of a particle of thermodynamic average momentum in an ideal gas. It is roughly the average de Broglie wavelength of particles in an ideal gas at the specified temperature.

Source: Wikipedia — Thermal de Broglie wavelength (CC BY-SA 4.0)