Pounds per Square Inch (psi) – The Imperial Standard for Pressure
Thepounds per square inch (psi)is an imperial unit of pressure that quantifies the force exerted per square inch of area. It is widely used in the United States for measuring tire pressure, hydraulic systems, and other mechanical applications.
History & Background
Rooted in the imperial system, psi has been a practical unit for everyday and industrial measurements for centuries. Its use in automotive, aerospace, and construction industries makes it one of the most recognized units for pressure.
Conversion Factors
- 1 psi ≈ 6,894.76 Pa
- 1 psi ≈ 0.00689476 bar
- 1 psi ≈ 0.0689476 kPa
- 1 atm ≈ 14.696 psi
Applications
Psi is essential for determining tire inflation levels, hydraulic system performance, and pressure in gas cylinders. It is also commonly used in engineering to ensure safety and efficiency.
Interesting Facts
Many pressure gauges and sensors in the US display measurements in psi, making it a familiar unit for both professionals and consumers.
Conclusion
The pounds per square inch remains a vital unit in the imperial system, providing a practical and intuitive measure of pressure for everyday applications.
Torr – A Unit for Vacuum and Low-Pressure Measurements
Thetorris a unit of pressure named after Evangelista Torricelli, the inventor of the barometer. One torr is defined as 1/760 of an atmosphere, approximately equal to 133.322 pascals.
History & Background
The torr was developed to facilitate precise measurements in low-pressure environments, especially in vacuum systems and laboratory applications.
Conversion Factors
- 1 torr ≈ 133.322 Pa
- 1 torr ≈ 0.133322 kPa
- 1 torr ≈ 1/760 atm
Applications
Torr is used extensively in vacuum technology, scientific research, and the calibration of pressure measurement instruments.
Interesting Facts
Many laboratory instruments, such as vacuum gauges and mass spectrometers, use torr as the primary unit for pressure measurement.
Conclusion
The torr offers a precise and practical unit for low-pressure environments, making it indispensable in both scientific research and industrial applications.