Sep 25, 2025 ·Pressure, in the physical sciences,perpendicular force per unit area, or the stress at a point within a confined fluid. May 25, 2025 ·Pressureisn’t just a physical phenomenon—it’s a silent sculptor of matter, a regulator of weather, and a key player in engineering, medicine, and astrophysics. Atmosphericpressureis the force exerted by the weight of the air in the Earth’s atmosphere. It’s like the air is a giant ocean above us, and just like waterpressureincreases with depth, the airpressureis highest at the Earth’s surface because of all the air above pressing down. Atmosphericpressureis measured using a barometer. DefinitionPressureis the amount of force applied perpendicular to the surface of an object per unit area. The symbol for it is "p" or P. [2] The IUPAC recommendation forpressureis a lower-case p. [3] However, upper-case P is widely used.
