What is Boltzmann’s constant?Give its value.

Gas constant per one molecule is called Boltzmann constant $\mathrm{K}=\frac{\mathrm{R}}{\mathrm{N}}$
$\mathrm{K}=1.38\times {10}^{-23}{\mathrm{J}}^{-{\mathrm{K}}^{-1}}{\text{ molecule }}^{-1}$
$\mathrm{K}=1.38\times {10}^{-16}{\mathrm{ergK}}^{-1}{\text{ molecule }}^{-1}$