never did like thermodynamics
and am now remembering why. It shares something in common with fluid mechanics in that 'engineering' came first and science followed: I reckon that always complicates the basis. Remember a thermodynamics text book which opened with the caution that a high proportion of the subjects 'founding fathers' died by their own hand...........
Of course in 'pure physics' they change the rules as they go along (eg electromagnetic waves have momentum: so preserving the conservation of momentum, define a new quantum number if an 'allowed' transition doesn't work, and most egregious of all invent 'the ether' with convenient properties to hide the fact that the theories aren't working. We all laugh but dark matter + dark energy = the 21st century's take on the ether.