mmHg to atm Converter - Millimeters of Mercury to Standard Atmosphere
Millimeters of Mercury (mmHg) to Standard Atmosphere (atm)
Direct answer
1 mmHg = 0.001315785838 atm
atm = mmHg × 0.001315785838
Converter
Conversion formula
atm = mmHg × 0.001315785838
mmHg = atm × 760.002100179
Example: 10 mmHg = 10 × 0.001315785838 = 0.013157858377 atm.
Common conversion table
| mmHg | atm |
|---|---|
| 1 mmHg | 0.001315785838 atm |
| 2 mmHg | 0.002631571675 atm |
| 5 mmHg | 0.006578929188 atm |
| 10 mmHg | 0.013157858377 atm |
| 20 mmHg | 0.026315716753 atm |
| 50 mmHg | 0.065789291883 atm |
| 100 mmHg | 0.131578583765 atm |
| 1,000 mmHg | 1.31578583765 atm |
Conversion derivation
Express both mmHg and atm in the same base unit Pa (pascal), then cancel the shared base unit.
- 1
Rewrite mmHg in the base unit
- 2
Rewrite atm in the base unit
- 3
Forward conversion
- 4
Reverse conversion
AI explanation for this conversion
This pre-generated explanation is schema-checked. Numeric results still come from the page formula and calculator.
Why the mmHg to atm conversion factor holds
This conversion factor is derived by expressing both the millimeter of mercury (mmHg) and the standard atmosphere (atm) in terms of the same base unit of pressure, the pascal (Pa). The factor is the ratio of their defined values in pascals.
Definition
The millimeter of mercury (mmHg) is a unit of pressure defined as the pressure exerted by a column of mercury 1 millimeter high, using a specific density and standard gravity. The standard atmosphere (atm) is a unit of pressure defined as exactly 101,325 pascals.
Principle
The conversion works because both units are defined relative to the pascal. By dividing the pascal value of 1 mmHg by the pascal value of 1 atm, you obtain the factor that converts a pressure in mmHg to the equivalent pressure in atm.
Assumptions
- The conversion uses the defined relationship: 1 mmHg = 133.322 Pa.
- The conversion uses the defined relationship: 1 atm = 101,325 Pa.
Cautions
- The conversion factor is based on the exact defined values of the units. Practical measurements may have slight variations.
- This conversion is for pressure equivalence, not for direct height measurement of a mercury column.
FAQ
How many atm are in 1 mmHg?
1 mmHg = 0.001315785838 atm.
How many atm are in 10 mmHg?
10 mmHg = 0.013157858377 atm.
How many atm are in 100 mmHg?
100 mmHg = 0.131578583765 atm.
What is the formula to convert mmHg to atm?
Use atm = mmHg × 0.001315785838.
How many mmHg are in 1 atm?
1 atm = 760.002100179 mmHg.
What should I check when converting mmHg to atm?
Use the conversion factor and round the result to the precision required by your calculation.