A textbook for undergraduate university students enrolled in engineering or engineering science. The book presents thermodynamics in an exact manner, while at the same time keeps the presentation simple enough for the beginner student. The subjects treated in the book include the first and second laws of thermodynamics and their applications, e.g. power generation, internal combustion engines, pumps and compressors, refrigeration (conventional and absorption), osmosis, combustion and chemical processes and many more.