Atmosphere to mmH2O Converter
Pressure · unit-converter
Convert Atmosphere to mmH2O with a fixed input and output unit, step-by-step formula line, and reference tables. All calculations bridge through pascal with fixed definitions (standard atmosphere = 101,325 Pa; torr and mmHg = atm/760; plus industrial/manometer units like kgf/cm², inHg, inH2O, and mmH2O).
About Atmosphere
The standard atmosphere (atm) is defined as exactly 101,325 Pa. It links legacy chemistry and physics problems to SI.
About mmH2O
Millimeters of water column (mmH2O) is used for very low differential pressure in instrumentation and ventilation.
How to convert atmosphere to millimeter of water (mmh2o, 4 °c)
1 atmosphere equals 10332.27452799886 mmh2o in this tool (via pascal):
1 atm = (101325 Pa ÷ 9.80665 Pa) mmh2o = 10332.27452799886 mmh2o
Each atmosphere carries 101325 Pa and each mmh2o 9.80665 Pa, so one atm equals 101325 ÷ 9.80665 mmh2o.
Let p(atm) be pressure in Atmosphere (atm), and p(mmh2o) in mmH2O (mmh2o). Then:
p(mmh2o) = p(atm) × (101325 / 9.80665)
Equivalently, divide by how many atm fit into one mmh2o (Pa per mmh2o divided by Pa per atm):
p(mmh2o) = p(atm) ÷ 0.00009678411053540586
Examples
Example #1: Convert 1 atm to mmh2o
1 atm = 1 atm × (101325/9.80665) mmh2o = 10332.274528 mmh2o
1 atm = 1 atm ÷ 0.00009678411053540586 = 10332.274528 mmh2o
1 atm × (101,325/9.80665) = 10,332.274528 mmh2o
Example #2: Convert 10 atm to mmh2o
10 atm = 10 atm × (101325/9.80665) mmh2o = 103322.74528 mmh2o
10 atm = 10 atm ÷ 0.00009678411053540586 = 103322.74528 mmh2o
10 atm × (101,325/9.80665) = 103,322.745280 mmh2o
Summary
To convert Atmosphere to mmH2O, multiply the value in atm by (101325 Pa per atm) / (9.80665 Pa per mmh2o). Equivalently: value_mmh2o = value_atm × (101325 / 9.80665). Numerically, 1 atm equals 10332.27452799886 mmh2o.
Relationship context
Both Atmosphere and mmH2O are converted by fixed multiples of the pascal. Multiplying by (Pa per atm) ÷ (Pa per mmh2o) gives the same result as passing through pascal, keeping bar, atm, PSI, kPa, hPa, torr, and mmHg consistent on the hub.
Conversion tables
| Atmosphere (atm) | mmH2O (mmh2o) |
|---|---|
| 0.1 | 1,033.2274528 |
| 1 | 10,332.274528 |
| 2 | 20,664.549056 |
| 3 | 30,996.823584 |
| 4 | 41,329.098112 |
| 5 | 51,661.37264 |
| 6 | 61,993.647168 |
| 7 | 72,325.921696 |
| 8 | 82,658.196224 |
| 9 | 92,990.470752 |
| Atmosphere (atm) | mmH2O (mmh2o) |
|---|---|
| 10 | 103,322.74528 |
| 20 | 206,645.49056 |
| 30 | 309,968.23584 |
| 40 | 413,290.98112 |
| 50 | 516,613.7264 |
| 60 | 619,936.47168 |
| 70 | 723,259.21696 |
| 80 | 826,581.96224 |
| 90 | 929,904.7075200001 |
| 100 | 1,033,227.4528 |