This book covers topics listed on CHED memorandum intended for Thermodynamics 1. The book presented the lectures from fundamental concepts to quiet complex principles. It also presented sample problems at the end of every topics on each chapters. This book is a compilation of lectures presented by the author derived from standard books and references. The author wishes that with the use of this book students learning in thermodynamics will be improved.

L. E. Luceña, a registered and professional mechanical engineer, a professional teacher in mathematics and physics. Faculty member of Mechanical Engineering at Camarines Sur Polytechnic Colleges, Philippines. Bachelor of Science in Mechanical Engineering and Master of Engineering Technology. Member of the Philippine Society of Mechanical Engineers.