Pressure Converter — PSI, Bar, Atm, kPa, mmHg, Pa, Torr
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Understanding Pressure Units and Conversions
Pressure is the force applied per unit area. The SI unit is the Pascal (Pa), defined as one Newton per square meter. Since a Pascal is quite small, kilopascals (kPa) and bars are more commonly used in everyday applications. Standard atmospheric pressure at sea level is defined as exactly 101,325 Pa, or 1 atm, or 1.01325 bar.
In the United States, PSI (pounds per square inch) is the most common pressure unit for tire pressure, hydraulics, and compressed gas. One atmosphere equals approximately 14.696 PSI. In meteorology, pressure is often measured in millibars or inches of mercury (inHg), where standard pressure is 29.92 inHg.
In medicine and science, mmHg (millimeters of mercury) is used for blood pressure readings and vacuum measurements. One mmHg is essentially equal to one torr. This converter handles all common pressure units with precise conversion factors for engineering, automotive, weather, and scientific applications.
Frequently Asked Questions
What is standard atmospheric pressure?
Standard atmospheric pressure at sea level is 101,325 Pa (101.325 kPa), which equals 1 atm, 1.01325 bar, 14.696 PSI, 760 mmHg, or 29.92 inHg.
How do I convert PSI to bar?
To convert PSI to bar, multiply the PSI value by 0.0689476. For example, 30 PSI equals approximately 2.07 bar. One bar equals 100,000 Pascals.
What is the difference between mmHg and torr?
For practical purposes, mmHg and torr are the same unit. Both equal approximately 133.322 Pascals. The difference between them is negligible for most applications.
What pressure unit is used for tire pressure?
In the US, tire pressure is measured in PSI. Typical car tires are inflated to 30-35 PSI. In Europe, bar or kPa are used. 32 PSI equals about 2.2 bar or 220 kPa.