Definition:First Radiation Constant/Dimension

Definition
The first radiation constant has the dimension $\mathsf {M L^4 T^{-3} }$.

This arises from its definition as Planck's constant multiplied by speed of light squared:
 * $\mathsf {M L^2 T^{-1} } \times \paren {\mathsf {L T^{-1} } }^2$