What is Boltzmann's constant?

The Ideal gas law PV=nRT

Where n is number of moles of gas

              n=N/NA

Where N= number of gaseous molecules and NA is Avagadro's  number

            PV=(N/NA)×RT

            PV=N(R/NA)×T

            PV=N(Kb)×T

Where Kb is Boltzmann's constant

 Kb=R/NA= (8.31÷6.022×10^23)

                  = 1.38×10^-23