How Is Lorenz Number Calculated?

How Is Lorenz Number Calculated? Because the charge carriers (electrons in n-type or holes in p-type semiconductors) transport both heat and charge, κE is commonly estimated using the measured σ using the Wiedemann-Franz law: κE = LσT, where L is the Lorenz number. What is Lorenz number value? The Lorentz number is a dimensionless number