Pressure Converter
Convert seamlessly between Pascal, Bar, PSI, and Atmospheres. Estimate atmospheric pressure at various altitudes and depths, from the stratosphere to the ocean floor.
Understanding Pressure Measurement
Pressure is defined as the force applied perpendicular to the surface of an object per unit area. It plays a critical role in physics, engineering, meteorology, and even medicine. Converting between units is essential because different industries have standardized on different metrics.
Common Units Explained
- Pascal (Pa): The SI unit of pressure. One Pascal is very small (one newton per square meter), so Kilopascals (kPa) are more commonly used in meteorology and engineering.
- PSI (Pound-force per square inch): The standard unit in the United States for automotive tire pressure, industrial safety, and compressed gas systems.
- Bar: Approximately equal to atmospheric pressure at sea level. Widely used in industrial applications and meteorology (millibars).
- Atmosphere (atm): A unit based on the average air pressure at sea level. 1 atm = 101,325 Pa = 14.7 PSI. Used in chemistry and diving.
Pressure at Altitude and Depth
Pressure changes dramatically with altitude. As you go higher (like climbing Mount Everest), air becomes thinner, and pressure drops to about 30% of sea level. Conversely, underwater pressure increases rapidly—roughly 1 atmosphere for every 10 meters of depth. At the bottom of the Mariana Trench, the pressure is over 1,000 times greater than at the surface, enough to crush most submarines.