Intensity is defined as power per unit area, leading to a dimensional analysis that simplifies to mass per cubic time. This reduction lacks physical significance as it omits the geometric aspects of intensity, which relate to energy flow through an area. When intensity is divided by flow velocity, it results in a form that indicates energy density, specifically mc^2 per volume for light. This highlights the relationship between intensity, energy density, and the geometry of energy flow. Understanding these dimensions is crucial for grasping the physical implications of intensity in various contexts.
