Capillary Mechanics offers a comprehensive reexamination of capillary phenomena and their effects in light of rapid advancements in micro/nano electromechanical systems (MEMS/NEMS). Bridging classical understanding with modern applications, the book presents a systematic journey from foundational principles to cutting-edge practices, guiding readers from surface tension and wetting behavior to the intricacies of liquid bridges and capillary-driven microflows.Divided into eleven chapters, the text guides readers to understand the process of traditional capillary phenomena and their effects, the concept and measurement method of surface tension, the concept and characteristics of wetting and contact angle, the Young Laplace equation and its applications, the origin of the Kelvin equation and its application in practice, the concept of surface tension gradient and Marangoni effect, capillary flow based on the Hagen Poiseuille equation, the concept and function of liquid bridge, the application of capillary mechanics in micro/nano electromechanical systems, and the concept and preliminary analysis of capillary waves.This book is designed for undergraduate and graduate students majoring in mechanical engineering, mechanical and electronic engineering, mechanics, physics, and related disciplines. It is equally valuable to researchers and professionals seeking to deepen their understanding of capillarity in modern science and engineering.