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 |
Inch of mercury | 0.0289582 inHg | 0.0579164 inHg | 0.0868747 inHg | 0.1158329 inHg | 0.1447911 inHg | 0.1737493 inHg | 0.2027075 inHg | 0.2316658 inHg | 0.2606240 inHg | 0.2895822 inHg | 0.3185404 inHg | 0.3474986 inHg | 0.3764569 inHg | 0.4054151 inHg | 0.4343733 inHg | 0.4633315 inHg | 0.4922898 inHg | 0.5212480 inHg | 0.5502062 inHg | 0.5791644 inHg | 0.6081226 inHg | 0.6370809 inHg | 0.6660391 inHg | 0.6949973 inHg | 0.7239555 inHg | 0.7529137 inHg | 0.7818720 inHg | 0.8108302 inHg | 0.8397884 inHg | 0.8687466 inHg | 0.8977048 inHg | 0.9266631 inHg | 0.9556213 inHg | 0.9845795 inHg | 1.0135377 inHg | 1.0424959 inHg | 1.0714542 inHg | 1.1004124 inHg | 1.1293706 inHg | 1.1583288 inHg | 1.1872870 inHg | 1.2162453 inHg | 1.2452035 inHg | 1.2741617 inHg | 1.3031199 inHg | 1.3320782 inHg | 1.3610364 inHg | 1.3899946 inHg | 1.4189528 inHg | 1.4479110 inHg | 1.4768693 inHg | 1.5058275 inHg | 1.5347857 inHg | 1.5637439 inHg | 1.5927021 inHg | 1.6216604 inHg | 1.6506186 inHg | 1.6795768 inHg | 1.7085350 inHg | 1.7374932 inHg | 1.7664515 inHg | 1.7954097 inHg | 1.8243679 inHg | 1.8533261 inHg | 1.8822843 inHg | 1.9112426 inHg | 1.9402008 inHg | 1.9691590 inHg | 1.9981172 inHg | 2.0270754 inHg | 2.0560337 inHg | 2.0849919 inHg | 2.1139501 inHg | 2.1429083 inHg | 2.1718666 inHg | 2.2008248 inHg | 2.2297830 inHg | 2.2587412 inHg | 2.2876994 inHg | 2.3166577 inHg | 2.3456159 inHg | 2.3745741 inHg | 2.4035323 inHg | 2.4324905 inHg | 2.4614488 inHg | 2.4904070 inHg | 2.5193652 inHg | 2.5483234 inHg | 2.5772816 inHg | 2.6062399 inHg | 2.6351981 inHg | 2.6641563 inHg | 2.6931145 inHg | 2.7220727 inHg | 2.7510310 inHg | 2.7799892 inHg | 2.8089474 inHg | 2.8379056 inHg | 2.8668638 inHg | 2.8958221 inHg |
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) | Inches of mercury | centimeter of water (4 °C) | Inches of mercury |
---|---|---|---|
1 | ≈ 0.028958220688763 | 6 | ≈ 0.17374932413258 |
2 | ≈ 0.057916441377526 | 7 | ≈ 0.20270754482134 |
3 | ≈ 0.086874662066289 | 8 | ≈ 0.23166576551011 |
4 | ≈ 0.11583288275505 | 9 | ≈ 0.26062398619887 |
5 | ≈ 0.14479110344382 | 10 | ≈ 0.28958220688763 |
Inch of mercury (inHg and "Hg) is a unit of measurement for pressure. It is still used for barometric pressure in weather reports, refrigeration and aviation in the United States.
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
Inch of mercury | inHg | ≡ 13595.1 kg/m3 × 1 in × ɡ0 | ≈ 3.386389×103 Pa | Imperial/US |
Inches of mercury | centimeter of water (4 °C) | Inches of mercury | centimeter of water (4 °C) |
---|---|---|---|
1 | ≈ 34.532508428187 | 6 | ≈ 207.19505056912 |
2 | ≈ 69.065016856373 | 7 | ≈ 241.72755899731 |
3 | ≈ 103.59752528456 | 8 | ≈ 276.26006742549 |
4 | ≈ 138.13003371275 | 9 | ≈ 310.79257585368 |
5 | ≈ 172.66254214093 | 10 | ≈ 345.32508428187 |
centimeter of water (4 °C) | Inches of mercury |
---|---|
1 | ≈ 0.0289582 |
34.5325084 | ≈ 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 …) |