centimeter of water (4 °C) | 1 cmH2O | 2 cmH2O | 3 cmH2O | 4 cmH2O | 5 cmH2O | 6 cmH2O | 7 cmH2O | 8 cmH2O | 9 cmH2O | 10 cmH2O | 11 cmH2O | 12 cmH2O | 13 cmH2O | 14 cmH2O | 15 cmH2O | 16 cmH2O | 17 cmH2O | 18 cmH2O | 19 cmH2O | 20 cmH2O | 21 cmH2O | 22 cmH2O | 23 cmH2O | 24 cmH2O | 25 cmH2O | 26 cmH2O | 27 cmH2O | 28 cmH2O | 29 cmH2O | 30 cmH2O | 31 cmH2O | 32 cmH2O | 33 cmH2O | 34 cmH2O | 35 cmH2O | 36 cmH2O | 37 cmH2O | 38 cmH2O | 39 cmH2O | 40 cmH2O | 41 cmH2O | 42 cmH2O | 43 cmH2O | 44 cmH2O | 45 cmH2O | 46 cmH2O | 47 cmH2O | 48 cmH2O | 49 cmH2O | 50 cmH2O | 51 cmH2O | 52 cmH2O | 53 cmH2O | 54 cmH2O | 55 cmH2O | 56 cmH2O | 57 cmH2O | 58 cmH2O | 59 cmH2O | 60 cmH2O | 61 cmH2O | 62 cmH2O | 63 cmH2O | 64 cmH2O | 65 cmH2O | 66 cmH2O | 67 cmH2O | 68 cmH2O | 69 cmH2O | 70 cmH2O | 71 cmH2O | 72 cmH2O | 73 cmH2O | 74 cmH2O | 75 cmH2O | 76 cmH2O | 77 cmH2O | 78 cmH2O | 79 cmH2O | 80 cmH2O | 81 cmH2O | 82 cmH2O | 83 cmH2O | 84 cmH2O | 85 cmH2O | 86 cmH2O | 87 cmH2O | 88 cmH2O | 89 cmH2O | 90 cmH2O | 91 cmH2O | 92 cmH2O | 93 cmH2O | 94 cmH2O | 95 cmH2O | 96 cmH2O | 97 cmH2O | 98 cmH2O | 99 cmH2O | 100 cmH2O |
bar | 0.0009806 bar | 0.0019613 bar | 0.0029419 bar | 0.0039226 bar | 0.0049032 bar | 0.0058838 bar | 0.0068645 bar | 0.0078451 bar | 0.0088257 bar | 0.0098064 bar | 0.0107870 bar | 0.0117677 bar | 0.0127483 bar | 0.0137289 bar | 0.0147096 bar | 0.0156902 bar | 0.0166708 bar | 0.0176515 bar | 0.0186321 bar | 0.0196128 bar | 0.0205934 bar | 0.0215740 bar | 0.0225547 bar | 0.0235353 bar | 0.0245160 bar | 0.0254966 bar | 0.0264772 bar | 0.0274579 bar | 0.0284385 bar | 0.0294191 bar | 0.0303998 bar | 0.0313804 bar | 0.0323611 bar | 0.0333417 bar | 0.0343223 bar | 0.0353030 bar | 0.0362836 bar | 0.0372642 bar | 0.0382449 bar | 0.0392255 bar | 0.0402062 bar | 0.0411868 bar | 0.0421674 bar | 0.0431481 bar | 0.0441287 bar | 0.0451093 bar | 0.0460900 bar | 0.0470706 bar | 0.0480513 bar | 0.0490319 bar | 0.0500125 bar | 0.0509932 bar | 0.0519738 bar | 0.0529545 bar | 0.0539351 bar | 0.0549157 bar | 0.0558964 bar | 0.0568770 bar | 0.0578576 bar | 0.0588383 bar | 0.0598189 bar | 0.0607996 bar | 0.0617802 bar | 0.0627608 bar | 0.0637415 bar | 0.0647221 bar | 0.0657027 bar | 0.0666834 bar | 0.0676640 bar | 0.0686447 bar | 0.0696253 bar | 0.0706059 bar | 0.0715866 bar | 0.0725672 bar | 0.0735479 bar | 0.0745285 bar | 0.0755091 bar | 0.0764898 bar | 0.0774704 bar | 0.0784510 bar | 0.0794317 bar | 0.0804123 bar | 0.0813930 bar | 0.0823736 bar | 0.0833542 bar | 0.0843349 bar | 0.0853155 bar | 0.0862961 bar | 0.0872768 bar | 0.0882574 bar | 0.0892381 bar | 0.0902187 bar | 0.0911993 bar | 0.0921800 bar | 0.0931606 bar | 0.0941412 bar | 0.0951219 bar | 0.0961025 bar | 0.0970832 bar | 0.0980638 bar |
A centimetre of water (US spelling centimeter of water, abbreviated cm H2O or cm H2O) is a less commonly used unit of pressure derived from pressure head calculations using metrology.
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
centimeter of water (4 °C) | cmH2O | ≈ 999.972 kg/m3 × 1 cm × ɡ0 | ≈ 98.0638 Pa | Metric system SI |
centimeter of water (4 °C) | bars | centimeter of water (4 °C) | bars |
---|---|---|---|
1 | ≈ 0.000980638 | 6 | ≈ 0.005883828 |
2 | ≈ 0.001961276 | 7 | ≈ 0.006864466 |
3 | ≈ 0.002941914 | 8 | ≈ 0.007845104 |
4 | ≈ 0.003922552 | 9 | ≈ 0.008825742 |
5 | ≈ 0.00490319 | 10 | ≈ 0.00980638 |
The bar is a metric unit of pressure, but is not approved as part of the International System of Units (SI). It is defined as exactly equal to 100,000 Pa, which is slightly less than the current average atmospheric pressure on Earth at sea level.
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
bar | bar | ≡ 105 Pa | ≡ 105 Pa | Metric system SI |
bars | centimeter of water (4 °C) | bars | centimeter of water (4 °C) |
---|---|---|---|
1 | ≈ 1019.7442889221 | 6 | ≈ 6118.4657335327 |
2 | ≈ 2039.4885778442 | 7 | ≈ 7138.2100224548 |
3 | ≈ 3059.2328667663 | 8 | ≈ 8157.9543113769 |
4 | ≈ 4078.9771556884 | 9 | ≈ 9177.698600299 |
5 | ≈ 5098.7214446105 | 10 | ≈ 10197.442889221 |
centimeter of water (4 °C) | bars |
---|---|
1 | ≈ 0.0009806 |
1,019.7442889 | ≈ 1 |
Symbol | Definition |
---|---|
≡ | exactly equal |
≈ | approximately equal to |
= | equal to |
digits | indicates that digits repeat infinitely (e.g. 8.294 369 corresponds to 8.294 369 369 369 369 …) |