Understanding Pressure
Pressure is the force applied perpendicular to the surface of an object per unit area over which that force is distributed. It is a critical concept in physics, engineering, and meteorology.
Introduction & History
The study of pressure began with Evangelista Torricelli, who invented the barometer in 1643. Blaise Pascal later established Pascal's principle, which is fundamental to hydraulics. The SI unit of pressure, the Pascal, is named in his honor.
Key Units
Pascal (Pa)
The SI unit of pressure, equal to one newton per square meter.
Kilopascal (kPa)
Commonly used in weather forecasting and engineering.
Bar (bar)
Approximately equal to atmospheric pressure at sea level.
Pounds per square inch (PSI)
A standard unit in the imperial system, especially for tire pressure.
Atmosphere (atm)
A unit of pressure defined as 101,325 Pa.
Practical Applications
Weather Forecasting
Hydraulic Systems
Automotive (Tire Pressure)
Medical (Blood Pressure)
Aviation and Diving