Definition:First Radiation Constant/Also defined as/Dimension

Definition
The first radiation constant when defined as $8 \pi h c$ has the dimension $\mathsf {M L^3 T^{-2} }$.

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