Monckton indicated to me (5) that he obtained his graph of IPCC temperature predictions by running his Fantasy CO2 predictions (loosely based on the A2 emissions scenario) through the IPCC's standard equation for converting CO2 concentration to temperature change, which can be found here. (realclimate.org)
In addition to allowing astronomers to deduce the planet's size, this This transmission spectrum is used to determine the composition, temperature, and pressure of its atmosphere by means of a standard equation. (newatlas.com)
Uranium - 235 undergoes spontaneous fission during radioactive decay; however, no standard equation can represent this reaction as its results are quite unpredictable. (chemistrylearner.com)