Hi all. I am doing some work with temperature equations. I have a book that gives an equation and then manipulates it. However, I can not follow what the author does, so can anyone help: He starts with: dT/dt = Q/MC - (T-O)/RMC (in the following I use the text "delta" to represent lower case delta) He then says he solves this for delta T (change in temperature), due to a step change in source temperature (delta O). The equation then becomes: delta T(t) = delta O (1- e^(-t/RMC)) I use this 2nd equation in my work, but just cant follow how the author jumps from the 1st eqn to this one. I 'solve' the original ODE - but it comes no where near what he gets. Any help would be great.