Torr to Pascals (Torr to Pa)
1 torr equals 133.3223684 pascals (rounded).
How to convert torr to pascals
To convert torr to pascals, multiply the number of torr by 133.3223684. The factor is rounded to 10 significant digits. To go the other way, multiply pascals by 0.007500616827 (rounded).
pascals = torr × 133.3223684
Example: 10 torr = 1,333.223684 pascals.
About these units
Torr (Torr)
Exactly 1/760 of a standard atmosphere (about 133.322 Pa), named after Evangelista Torricelli. Used for vacuum measurement.
In 1643 Evangelista Torricelli filled a meter-long tube, sealed at one end, with mercury and stood it in a basin of mercury. The column fell to about 76 cm and left a Torricellian vacuum above it, the first recorded creation of a permanent vacuum. In a letter dated 11 June 1644 he described living at the bottom of a sea of air, an idea that also explained why suction pumps could raise water only about 10 meters.
The torr honors him. It was originally meant to equal one millimeter of mercury at 0 degrees Celsius, but the weight of a mercury column varies with gravity, which changes with elevation and latitude. In 1954 the 10th CGPM defined the standard atmosphere as 101,325 Pa, and the torr was then fixed as exactly one 760th of that, about 133.32 Pa.
Today the torr is mostly met in high-vacuum physics and engineering. It differs from the millimeter of mercury by less than one part in seven million, so the two are interchangeable except in the most exacting work.
1 torr = 133.3223684 pascals (approximately).
Sources: Wikipedia: Torr; Wikipedia: Evangelista Torricelli; Wikipedia: Standard atmosphere (unit)
Pascal (Pa)
The SI unit of pressure: one newton per square meter. A very small unit; atmospheric pressure is about 101,325 Pa.
Blaise Pascal never saw a pascal, because the name was adopted by the 14th CGPM in 1971 for the newton per square meter. He did, however, earn the honor. In 1647 he published experiments on the vacuum, and on 19 September 1648 his brother-in-law Florin Périer carried a mercury barometer up the Puy de Dôme near Clermont, where the column stood at about 23 inches against about 26 at the base. Pascal had reasoned that air pressure should fall with altitude, and the result confirmed it.
One pascal is a tiny pressure, so the unit is mostly met with prefixes. Standard atmospheric pressure is 101,325 Pa, a typical sea-level reading is about 1,013 hPa, and the threshold of hearing in air is taken as a reference pressure of 20 micropascals. Building airtightness tests, in contrast, are run at 50 Pa.
Pascal is also remembered for hydrostatics, where he showed that pressure depends on height difference rather than the weight of the fluid, and for the hydraulic press.
The pascal is the reference unit for pressure on this site.
Sources: Wikipedia: Pascal (unit); Wikipedia: Blaise Pascal
Related conversions
- Pascals to torr (reverse)
- Torr to kilopascals
- Torr to bars
- Torr to standard atmospheres
- Torr to PSI
- Torr to hectopascals
- Torr to megapascals
- Torr to millibars
- Torr to millimeters of mercury
- Torr to inches of mercury
- Kilopascals to pascals
- Bars to pascals
- Standard atmospheres to pascals
- PSI to pascals
- Hectopascals to pascals
- Megapascals to pascals
- Millibars to pascals
- Millimeters of mercury to pascals
- Inches of mercury to pascals
- Gigapascals to pascals
- Kilopounds per square inch to pascals
- Millimeters of water to pascals
See all pressure units.