The torr is convenient for measuring vacuum pressures in physics, engineering, and science applications because of its relationship to atmospheric pressure. You may also use torr in various pressure, partial pressure, and gas law questions. The torr unit is primarily encountered when measuring high vacuum pressure and vapor pressure. If you need to convert from mmHg to Torr then, vice versa, multiply mmHg by the conversion factor 0.999999857533699 to solve for Torr. Both the multiplication and division approaches will return the same answer. To try your more conversion examples, multiply the torr value by the conversion factor to find your answer.Īn alternative approach is to divide the torr value by 0.999999857533699 to solve for millimeters of mercury. Using the conversion formula, we multiply 10 Torr by the conversion factor 1.0142466321. To practice conversion calculations, consider an example of converting 10 Torr to mmHg.
Measurements are made using a manometer, such as a barometer or a transducer equivalent. Typical uses of the mmHg pressure measurement include chemistry measurements, general science, blood pressure readings, central venous pressure measurements, cerebrospinal fluid pressure, intramuscular pressure recordings, gas pressure gauges, and a meteorologist’s weather reports. Millimeters of mercury is used to measure atmospheric pressures and benefit from being independent of the volume of the mercury column. The mmHg is a manometric unit of pressure and is an abbreviation for millimeters of mercury. In the past, it was defined as the pressure exerted by a one millimeter high column of mercury. The unit definition of a millimeter of mercury is that it is equal to 133.322387415 pascals (Pa), which is derived from the known accuracies of mercury’s density and standard gravity. What does mmHg stand for?Īn mmHg is a unit of pressure equal to the extra pressure generated by a column of mercury that is one millimeter high under standard gravity. The torr is not part of the International System of Units (SI Units). ‘T’ is an abbreviation for the tesla unit, which is used to measure the strengths of magnetic fields. Similarly, you may encounter ‘T’ as a symbol for torr, but this is also incorrect. If you see a spelling that uses ‘Tor’, it is not correct but a common mistake. The abbreviation for the unit name torr is Torr, while the unit name is entirely in lower case (torr). Torr is also encountered when it is used to express pressure measurements in a thermodynamic system. We have Torricelli to thank for mercury barometers, modern weather reporting, and manometric pressure readings in areas such as physiology, medicine, general chemistry, industrial chemistry, scuba diving, and car tire pressures. These changes in the pressure exerted by atmospheric pressure are due to weather conditions and can predict the weather. He explained the principle that small fluctuations in the height of the mercury column were due to changes in atmospheric pressure. Torricelli invented and then demonstrated a mercury barometer to the public in 1644, which subsequently led to the creation of the field of meteorology. The unit is named in honor of Evangelista Torricelli, an Italian physicist, mathematician, and discoverer of barometric pressure theory.
It is defined as precisely 1/760 of a standard atmosphere and is equivalent to 133.32 Pascals (Pa). Torr is a unit of pressure based on an absolute scale. Here are the answers to some of the most common questions people ask about the Torr and mmHg pressure measurement units. People often have specific questions about converting Torr to mmHg and other unit conversions. Conversion Table: Torr to mmHg torr (Torr)įrequently Asked Questions About Torr to mmHg
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