Pascal (Pa)
The pascal is the SI unit of pressure, defined as one newton of force applied over an area of one square meter. 1 Pa = 1 N/m².
Common uses: Scientific measurements, atmospheric pressure, fluid dynamics calculations.
Pressure Converter
Convert between pascal, bar, psi, atm, torr, and other pressure units with scientific precision.
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Pressure Units Explained
Bar (bar)
A metric unit of pressure, approximately equal to atmospheric pressure. 1 bar = 100,000 Pa = 0.986923 atm.
Common uses: Weather forecasting, industrial equipment specifications, scuba diving depth calculations.
Pound-force per Square Inch (psi)
Imperial/US customary unit of pressure. 1 psi = 6,894.76 Pa = 0.068946 bar.
Common uses: Tire pressure, hydraulic systems, compressed air specifications, industrial applications in US.
Atmosphere (atm)
Standard atmospheric pressure at sea level. 1 atm = 101,325 Pa = 1.01325 bar = 14.696 psi.
Key reference: Used as a reference point in chemistry and physics; represents normal sea-level pressure.
Torr (Torr)
A unit of pressure based on the height of mercury column. 1 Torr = 1 mmHg ≈ 133.322 Pa.
Note: Commonly used in vacuum technology and medical applications (blood pressure measurements).
Millimeter of Mercury (mmHg)
Represents the pressure exerted by a 1 mm column of mercury. 1 mmHg = 1 Torr ≈ 133.322 Pa.
Medical use: Blood pressure measurements are expressed in mmHg (e.g., 120/80 mmHg).
Pressure Reference Values
- Standard atmospheric pressure: 101,325 Pa = 1 atm = 760 mmHg
- Vacuum pressure: 0 Pa (absolute)
- Tire pressure (car): Typically 30-35 psi (206-241 kPa)
- Scuba diving depth (10m): About 2 bar absolute pressure
- Normal blood pressure: 120/80 mmHg = 16.0/10.7 kPa
- Water pressure at 10m depth: Approximately 1 bar or 100 kPa