In thermodynamics, processes at constant pressure allow for volume changes primarily through temperature variations. A common example is a balloon, where heating the air inside causes it to expand while maintaining nearly constant pressure. This principle can also be applied to atmospheric modeling, illustrating how temperature affects volume without altering pressure. In engines, heat supplied to a chamber can drive a piston under constant external load, demonstrating practical applications of this concept. Understanding these scenarios clarifies how temperature influences volume in constant pressure systems.