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.
Millimeters of Mercury (mmHg) – Common in Medicine and Meteorology
Themillimeter of mercury (mmHg)is a unit of pressure based on the height of a mercury column. It is commonly used in medical contexts, particularly for measuring blood pressure, and in meteorology for atmospheric pressure.
History & Background
The mmHg became popular when mercury barometers were used to measure atmospheric pressure. Its continued use in medicine and meteorology attests to its practicality and historical significance.
Conversion Factors
- 1 mmHg ≈ 133.322 Pa
- 1 mmHg ≈ 0.133322 kPa
- 1 mmHg ≈ 0.00131579 atm
Applications
mmHg is used to monitor blood pressure, calibrate barometric readings, and analyze pressure changes in various scientific fields.
Interesting Facts
Normal human blood pressure is often cited in mmHg (e.g., 120/80 mmHg), making this unit familiar to healthcare professionals and patients alike.
Conclusion
Millimeters of mercury continue to be a vital unit in medicine and atmospheric sciences, providing a direct and understandable measure of pressure.