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 |
pound per (square inch) | 0.0142230 lb/in2 | 0.0284459 lb/in2 | 0.0426689 lb/in2 | 0.0568918 lb/in2 | 0.0711148 lb/in2 | 0.0853377 lb/in2 | 0.0995607 lb/in2 | 0.1137836 lb/in2 | 0.1280066 lb/in2 | 0.1422295 lb/in2 | 0.1564525 lb/in2 | 0.1706754 lb/in2 | 0.1848984 lb/in2 | 0.1991213 lb/in2 | 0.2133443 lb/in2 | 0.2275672 lb/in2 | 0.2417902 lb/in2 | 0.2560131 lb/in2 | 0.2702361 lb/in2 | 0.2844590 lb/in2 | 0.2986820 lb/in2 | 0.3129049 lb/in2 | 0.3271279 lb/in2 | 0.3413508 lb/in2 | 0.3555738 lb/in2 | 0.3697967 lb/in2 | 0.3840197 lb/in2 | 0.3982426 lb/in2 | 0.4124656 lb/in2 | 0.4266886 lb/in2 | 0.4409115 lb/in2 | 0.4551345 lb/in2 | 0.4693574 lb/in2 | 0.4835804 lb/in2 | 0.4978033 lb/in2 | 0.5120263 lb/in2 | 0.5262492 lb/in2 | 0.5404722 lb/in2 | 0.5546951 lb/in2 | 0.5689181 lb/in2 | 0.5831410 lb/in2 | 0.5973640 lb/in2 | 0.6115869 lb/in2 | 0.6258099 lb/in2 | 0.6400328 lb/in2 | 0.6542558 lb/in2 | 0.6684787 lb/in2 | 0.6827017 lb/in2 | 0.6969246 lb/in2 | 0.7111476 lb/in2 | 0.7253705 lb/in2 | 0.7395935 lb/in2 | 0.7538164 lb/in2 | 0.7680394 lb/in2 | 0.7822623 lb/in2 | 0.7964853 lb/in2 | 0.8107082 lb/in2 | 0.8249312 lb/in2 | 0.8391542 lb/in2 | 0.8533771 lb/in2 | 0.8676001 lb/in2 | 0.8818230 lb/in2 | 0.8960460 lb/in2 | 0.9102689 lb/in2 | 0.9244919 lb/in2 | 0.9387148 lb/in2 | 0.9529378 lb/in2 | 0.9671607 lb/in2 | 0.9813837 lb/in2 | 0.9956066 lb/in2 | 1.0098296 lb/in2 | 1.0240525 lb/in2 | 1.0382755 lb/in2 | 1.0524984 lb/in2 | 1.0667214 lb/in2 | 1.0809443 lb/in2 | 1.0951673 lb/in2 | 1.1093902 lb/in2 | 1.1236132 lb/in2 | 1.1378361 lb/in2 | 1.1520591 lb/in2 | 1.1662820 lb/in2 | 1.1805050 lb/in2 | 1.1947279 lb/in2 | 1.2089509 lb/in2 | 1.2231738 lb/in2 | 1.2373968 lb/in2 | 1.2516198 lb/in2 | 1.2658427 lb/in2 | 1.2800657 lb/in2 | 1.2942886 lb/in2 | 1.3085116 lb/in2 | 1.3227345 lb/in2 | 1.3369575 lb/in2 | 1.3511804 lb/in2 | 1.3654034 lb/in2 | 1.3796263 lb/in2 | 1.3938493 lb/in2 | 1.4080722 lb/in2 | 1.4222952 lb/in2 |
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) | pound per (square inch) | centimeter of water (4 °C) | pound per (square inch) |
---|---|---|---|
1 | ≈ 0.014222951705228 | 6 | ≈ 0.085337710231366 |
2 | ≈ 0.028445903410455 | 7 | ≈ 0.099560661936594 |
3 | ≈ 0.042668855115683 | 8 | ≈ 0.11378361364182 |
4 | ≈ 0.056891806820911 | 9 | ≈ 0.12800656534705 |
5 | ≈ 0.071114758526138 | 10 | ≈ 0.14222951705228 |
The pound per square inch or, more accurately, pound-force per square inch (symbol: lbf/in2; abbreviation: psi) is a unit of pressure or of stress based on avoirdupois units.
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
pound per (square inch) | lb/in2 | ≡ 1 pound × ɡ0 / 1 sq in | = 6 894.75729 pascals | Imperial/US |
pound per (square inch) | centimeter of water (4 °C) | pound per (square inch) | centimeter of water (4 °C) |
---|---|---|---|
1 | ≈ 70.308893732125 | 6 | ≈ 421.85336239275 |
2 | ≈ 140.61778746425 | 7 | ≈ 492.16225612488 |
3 | ≈ 210.92668119638 | 8 | ≈ 562.471149857 |
4 | ≈ 281.2355749285 | 9 | ≈ 632.78004358913 |
5 | ≈ 351.54446866063 | 10 | ≈ 703.08893732125 |
centimeter of water (4 °C) | pound per (square inch) |
---|---|
1 | ≈ 0.0142230 |
70.3088937 | ≈ 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 …) |