Conversion of chemical to radiative heat...
What determines the rate at which chemical heat (convection) becomes electromagnetic heat (radiation)? I am trying to get a handle on the Earth's energy budget. Obviously, heat is being transfered in-system through convection... but what is the process that converts this chemical heat (brownian motion that needs a material medium) to photonic heat (that can leave the planet and travel through space)? What factors limit this phase transition? In terms of total energy transfer, how can one determine the delta between the rate of transfer (comparing convection and radiation) when a system has both. What are the limits of efficiency when comparing both chemical and radiative energy transfer? I know that convection is restricted by the sound limit, so I assume that radiative heat is likewise restricted by the speed of light. However, because light doesn't seem to interact with other light, how dense does light have to be before we see dramatic self limiting effects? I am guessing that E=mC^2 will answer my question as dense light becomes matter which provides the upper limit to the speed of light? All of my questions are motivated by a desire to understand the base physics that underlies and predicts the Earth's energy budget and how these natural systems are effected by green house gasses and human energy conversion (releasing heat), especially with regard to the ratio of rate of change vs. dissipative capacity of the natural systems.