Need Help with Units (Updated) I am trying to iteratively calculate the Closure Temperature (Tc) of an arbitrary radiogenic isotope system given the activation energy (E), diffusivity (d_o/a^2), and cooling rate (dT/dt). Values are: Closure Temp (Tc): 600C = 873.15K (A random number I picked for the first iteration) Activation Energy (E): 50000 cal/mol Ideal Gas Constant: 1.987 cal*K/mol A: 55 (unitless) Diffusivity (D(nought)/a^2): 100 cm^2/s Cooling Rate (dt/dT): 10 deg. C / million years = (3.171*10^ -13) deg. C / second Important note: Our professor said that D(nought) units will cancel Cooling rate (dt/dT) units. I've gotten it down to: Im having the most trouble converting C to K. Our answer for Tc should be in degrees Celcius and we are to plot Tc as a function of cooling rate.