How to convert torr to millimeters of mercury
To convert a measurement in torr to millimeters of mercury, multiply the value by 0.999999857534. The conversion factor comes from the relationship between both units and the pascal.
For example, to convert 5 Torr to millimeters of mercury: 5 × 0.999999857534 = 4.999999 mmHg.
What is a torr?
A torr is a unit of pressure defined as 1/760 of a standard atmosphere, approximately equal to one millimeter of mercury (about 133.32 pascals). Named after Evangelista Torricelli, inventor of the barometer, the torr is used mainly in vacuum technology and laboratory work where low pressures are measured against a mercury column.
Common uses of torr include: Vacuum system measurements; Laboratory and analytical instruments; Semiconductor process chambers; Physiology and respiratory gas pressures.
What is a millimeter of mercury?
A millimeter of mercury (mmHg) is a unit of pressure equal to the pressure exerted by a one-millimeter-high column of mercury, about 133.32 pascals. Derived from early mercury barometers, the mmHg is nearly identical to the torr. It remains the standard unit for blood pressure and other physiological measurements in medicine worldwide.
Common uses of millimeters of mercury include: Blood pressure readings (systolic/diastolic); Intraocular and intracranial pressure; Barometric pressure in medicine; Vacuum and gas-pressure measurement.
Torr to millimeters of mercury worked examples
Here are some common values converted:
1 Torr = 0.999999857534 mmHg 5 Torr = 4.999999 mmHg 10 Torr = 9.999999 mmHg 50 Torr = 49.999993 mmHg 100 Torr = 99.999986 mmHg
Frequently asked questions
How many millimeters of mercury are in one torr?
One torr (Torr) equals 0.999999857534 millimeters of mercury (mmHg). Multiply any value in torr by 0.999999857534 to convert to millimeters of mercury.
How do I convert torr to millimeters of mercury?
Multiply the value in torr by 0.999999857534. For example, 5 Torr × 0.999999857534 = 4.999999 mmHg.
How do I convert millimeters of mercury to torr?
Multiply the value in millimeters of mercury by 1, or divide by 0.999999857534. Use the swap button on the converter above to reverse the direction.
Is the torr to millimeter of mercury conversion exact?
These conversions use standard SI-derived definitions. 1 atm = 101,325 Pa and 1 psi = 6,894.757 Pa exactly by definition.
What is the formula for torr to millimeters of mercury?
The formula is: mmHg = Torr × 0.999999857534. This comes from the definition of both units relative to the pascal.