The term for the pressure exerted by a gas in a closed system is known as gas pressure. This pressure originates from the collisions of gas molecules with the walls of their container. Gas pressure is influenced by factors such as the number of gas molecules, temperature, and volume of the container, as described by gas laws like Boyle’s Law and Charles’s Law. Understanding gas pressure is crucial in various scientific and engineering applications, including meteorology, chemistry, and engineering, and is fundamental to understanding thermodynamics.