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 |
atmosphere | 0.0009678 atm | 0.0019356 atm | 0.0029034 atm | 0.0038713 atm | 0.0048391 atm | 0.0058069 atm | 0.0067747 atm | 0.0077425 atm | 0.0087103 atm | 0.0096781 atm | 0.0106460 atm | 0.0116138 atm | 0.0125816 atm | 0.0135494 atm | 0.0145172 atm | 0.0154850 atm | 0.0164528 atm | 0.0174207 atm | 0.0183885 atm | 0.0193563 atm | 0.0203241 atm | 0.0212919 atm | 0.0222597 atm | 0.0232275 atm | 0.0241954 atm | 0.0251632 atm | 0.0261310 atm | 0.0270988 atm | 0.0280666 atm | 0.0290344 atm | 0.0300022 atm | 0.0309701 atm | 0.0319379 atm | 0.0329057 atm | 0.0338735 atm | 0.0348413 atm | 0.0358091 atm | 0.0367769 atm | 0.0377448 atm | 0.0387126 atm | 0.0396804 atm | 0.0406482 atm | 0.0416160 atm | 0.0425838 atm | 0.0435517 atm | 0.0445195 atm | 0.0454873 atm | 0.0464551 atm | 0.0474229 atm | 0.0483907 atm | 0.0493585 atm | 0.0503264 atm | 0.0512942 atm | 0.0522620 atm | 0.0532298 atm | 0.0541976 atm | 0.0551654 atm | 0.0561332 atm | 0.0571011 atm | 0.0580689 atm | 0.0590367 atm | 0.0600045 atm | 0.0609723 atm | 0.0619401 atm | 0.0629079 atm | 0.0638758 atm | 0.0648436 atm | 0.0658114 atm | 0.0667792 atm | 0.0677470 atm | 0.0687148 atm | 0.0696826 atm | 0.0706505 atm | 0.0716183 atm | 0.0725861 atm | 0.0735539 atm | 0.0745217 atm | 0.0754895 atm | 0.0764573 atm | 0.0774252 atm | 0.0783930 atm | 0.0793608 atm | 0.0803286 atm | 0.0812964 atm | 0.0822642 atm | 0.0832320 atm | 0.0841999 atm | 0.0851677 atm | 0.0861355 atm | 0.0871033 atm | 0.0880711 atm | 0.0890389 atm | 0.0900067 atm | 0.0909746 atm | 0.0919424 atm | 0.0929102 atm | 0.0938780 atm | 0.0948458 atm | 0.0958136 atm | 0.0967814 atm |
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) | atmospheres | centimeter of water (4 °C) | atmospheres |
---|---|---|---|
1 | ≈ 0.00096781445842586 | 6 | ≈ 0.0058068867505551 |
2 | ≈ 0.0019356289168517 | 7 | ≈ 0.006774701208981 |
3 | ≈ 0.0029034433752776 | 8 | ≈ 0.0077425156674069 |
4 | ≈ 0.0038712578337034 | 9 | ≈ 0.0087103301258327 |
5 | ≈ 0.0048390722921293 | 10 | ≈ 0.0096781445842586 |
The standard atmosphere (symbol: atm) is a unit of pressure defined as 101325 Pa (1.01325 bar). It is sometimes used as a reference or standard pressure.
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
atmosphere | atm | ≡ 101325 Pa | Metric system SI |
atmospheres | centimeter of water (4 °C) | atmospheres | centimeter of water (4 °C) |
---|---|---|---|
1 | ≈ 1033.2559007503 | 6 | ≈ 6199.535404502 |
2 | ≈ 2066.5118015007 | 7 | ≈ 7232.7913052523 |
3 | ≈ 3099.767702251 | 8 | ≈ 8266.0472060026 |
4 | ≈ 4133.0236030013 | 9 | ≈ 9299.303106753 |
5 | ≈ 5166.2795037516 | 10 | ≈ 10332.559007503 |
centimeter of water (4 °C) | atmospheres |
---|---|
1 | ≈ 0.0009678 |
1,033.2559008 | ≈ 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 …) |