The term for the pressure exerted by a gas in a given volume is gas pressure. This pressure arises due to the collisions of gas molecules with the walls of the container they occupy. It is typically measured in units such as atmospheres (atm), pascals (Pa), or millimeters of mercury (mmHg). Gas pressure is influenced by factors including temperature, volume, and the amount of gas present, following Boyle's law and Charles's law. Understanding gas pressure is crucial in fields like chemistry, physics, and meteorology.