The dimensional formula of Boltzmann’s constant is, A=
J
K
=
ML2T−2
K1
=[ML2T−2K−1] The dimensional formula of Planck’s constant is, B=Js=[ML2T−1] The dimensional formula of speed of light is, C=[LT−1] The dimensional formula of A4B−3C−2 is, [A4B−3C−2]=[ML2T−2K−1]4[ML2T−1]−3[LT−1]−2 =[M1L0T−3K−4] This is the dimensional formula of Stefan’s constant.