40 inches of mercury (40 inHg)
40 inches of mercury equals 19.646166 pounds per square inch, 1.3545555 bars, 135.45555 kilopascals and 135,455.55 pascals.
40 inches of mercury = 19.6461659 pounds per square inch
What 40 inches of mercury means in practice
40 inches of mercury sits between standard atmospheric pressure at sea level (29.9213 inHg) and a car tire (absolute) (94.4959 inHg).
- Pressure on the surface of Mars: 0.180133 inHg
- Air pressure at the summit of Everest: 9.9516 inHg
- Pressure inside an airliner cabin: 22.1475 inHg
- Standard atmospheric pressure at sea level: 29.9213 inHg
- A car tire (absolute): 94.4959 inHg
- A road bicycle tire (absolute): 236.24 inHg
- An espresso machine: 295.3 inHg
- The surface of Venus: 2,716.76 inHg
- A pressure washer: 4,429.5 inHg
- A full scuba tank: 6,201.3 inHg
- The bottom of the Mariana Trench: 32,069.6 inHg
- The pressure needed to make synthetic diamond: 1,476,500 inHg
- The center of the Earth: 106,308,000 inHg
40 inches of mercury in all pressure units
| Unit | Value | Scientific notation |
|---|---|---|
| Pounds per square inch (psi) | 19.6461659 | 1.96462 × 101 |
| Bars (bar) | 1.354555456 | 1.35456 × 100 |
| Kilopascals (kPa) | 135.4555456 | 1.35456 × 102 |
| Pascals (Pa) | 135,455.5456 | 1.35456 × 105 |
| Standard atmospheres (atm) | 1.336842296 | 1.33684 × 100 |
| Millimeters of mercury (mmHg) | 1,016 | 1.016 × 103 |
| Hectopascals (hPa) | 1,354.555456 | 1.35456 × 103 |
| Megapascals (MPa) | 0.1354555456 | 1.35456 × 10-1 |
| Millibars (mbar) | 1,354.555456 | 1.35456 × 103 |
| Centimeters of water (cmH₂O) | 1,381.26216 | 1.38126 × 103 |
| Inches of water (inH₂O) | 543.804 | 5.43804 × 102 |
| Torr (Torr) | 1,016.000145 | 1.016 × 103 |
| Kilograms-force per square centimeter (kgf/cm²) | 1.38126216 | 1.38126 × 100 |
| Psig (gauge) (psig) | 4.950217123 | 4.95022 × 100 |
| Gigapascals (GPa) | 0.000135455546 | 1.35456 × 10-4 |
| Kilopounds per square inch (ksi) | 0.0196461659 | 1.96462 × 10-2 |
| Pounds per square foot (psf) | 2,829.047889 | 2.82905 × 103 |
| Barg (gauge bar) (barg) | 0.3413054561 | 3.41305 × 10-1 |
| Meters of water (mH₂O) | 13.8126216 | 1.38126 × 101 |
| Technical atmospheres (at) | 1.38126216 | 1.38126 × 100 |
| Feet of water (ftH₂O) | 45.317 | 4.5317 × 101 |
| Millimeters of water (mmH₂O) | 13,812.6216 | 1.38126 × 104 |
| Centimeters of mercury (cmHg) | 101.6 | 1.016 × 102 |
| Kilobars (kbar) | 0.001354555456 | 1.35456 × 10-3 |
| Meters of seawater (msw) | 13.54555456 | 1.35456 × 101 |
| Microns of mercury (µmHg) | 1,016,000 | 1.016 × 106 |
| Millitorrs (mTorr) | 1,016,000.145 | 1.016 × 106 |
| Feet of seawater (fsw) | 44.20396811 | 4.4204 × 101 |
| Baryes (Ba) | 1,354,555.456 | 1.35456 × 106 |
| Decibars (dbar) | 13.54555456 | 1.35456 × 101 |
| Kilograms-force per square meter (kgf/m²) | 13,812.6216 | 1.38126 × 104 |
| Kilograms-force per square millimeter (kgf/mm²) | 0.0138126216 | 1.38126 × 10-2 |
| Megapounds per square inch (Mpsi) | 0.000019646166 | 1.96462 × 10-5 |
| Ounces per square inch (ozf/in²) | 314.3386544 | 3.14339 × 102 |
| Centibars (cbar) | 135.4555456 | 1.35456 × 102 |
| Microbars (µbar) | 1,354,555.456 | 1.35456 × 106 |
| Tonnes-force per square meter (tf/m²) | 13.8126216 | 1.38126 × 101 |
| Planck pressures (pP) | 2.9236545 × 10-109 | 2.92365 × 10-109 |
| Grams-force per square centimeter (gf/cm²) | 1,381.26216 | 1.38126 × 103 |
| Long tons per square inch (LT/in²) | 0.00877060978 | 8.77061 × 10-3 |
| Short tons per square foot (tonf/ft²) | 1.414523945 | 1.41452 × 100 |
| Atomic units of pressure (Eh/a₀³) | 4.6040404 × 10-9 | 4.60404 × 10-9 |
| Feet of mercury (ftHg) | 3.333333333 | 3.33333 × 100 |
| Piezes (pz) | 135.4555456 | 1.35456 × 102 |
| Poundals per square foot (pdl/ft²) | 91,021.92416 | 9.10219 × 104 |
Other amounts of inches of mercury
About the inch of mercury
The inch of mercury is used for barometric pressure in US weather reports and in aviation, where altimeters are set in inHg. Read more about inches of mercury.