No matter the type of thermodynamic process, the First Law of Thermodynamics applies. The equation still holds true, but you have to know what is happening within those processes to determine what the First Law equation would look like. Watch the video below to see how the three ideal processes we have discussed use the principle of the First Law of Thermodynamics.
Question
In an isolated system, the system cannot exchange heat or work with the environment. How would this effect the First Law equation?
If both Q and W are zero, then the equation would just become \(\small\mathsf{ U_i = U_f }\).
