Convert Millimeters of Mercury (mmHg) to Atmospheres (atm)
Enter a value below to convert Millimeters of Mercury (mmHg) to Atmospheres (atm).
Conversion:
1 Millimeters of Mercury (mmHg) = 0.0013157858377 Atmospheres (atm)
How to Convert Millimeters of Mercury (mmHg) to Atmospheres (atm)
1 mmhg = 0.0013157858377 atm
1 atm = 760.00210018 mmhg
Example: convert 15 Millimeters of Mercury (mmHg) to Atmospheres (atm):
25 mmhg = 0.032894645941 atm
Millimeters of Mercury (mmHg) to Atmospheres (atm) Conversion Table
| Millimeters of Mercury (mmHg) | Atmospheres (atm) |
|---|---|
| 0.01 mmhg | 0.000013157858377 atm |
| 0.1 mmhg | 0.00013157858377 atm |
| 1 mmhg | 0.0013157858377 atm |
| 2 mmhg | 0.0026315716753 atm |
| 3 mmhg | 0.003947357513 atm |
| 5 mmhg | 0.0065789291883 atm |
| 10 mmhg | 0.013157858377 atm |
| 20 mmhg | 0.026315716753 atm |
| 50 mmhg | 0.065789291883 atm |
| 100 mmhg | 0.13157858377 atm |
| 1000 mmhg | 1.3157858377 atm |
Millimeters of Mercury (mmHg)
Definition
Millimeters of mercury (mmHg) is a unit of pressure based on the height of a mercury column, equal to approximately 133.322 pascals. It is nearly identical to the torr.
History
Millimeters of mercury originated from Torricelli's mercury barometer in the 17th century. Measuring pressure by mercury column height became the standard method for centuries and remains in medical practice.
Current use
mmHg is the standard unit for measuring blood pressure worldwide (e.g., 120/80 mmHg). It is also used in measuring intraocular pressure, cerebrospinal fluid pressure, and in some vacuum applications.
Atmospheres (atm)
Definition
A standard atmosphere (atm) is a unit of pressure defined as exactly 101,325 pascals. It represents the average atmospheric pressure at sea level.
History
The standard atmosphere was defined in 1954 as a reference standard for pressure. It was historically based on mercury barometer readings and the average weight of the Earth's atmosphere at sea level.
Current use
Atmospheres are used in chemistry (standard conditions for gas calculations), diving (dive depth pressure ratings), and as a reference point for comparing relative pressures across different systems.