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To convert from meter of water @ 4°C (mH2O) to pound per square inch (psi), use the following formula:
pound per square inch (psi)
= 9.80665 × 0.00014503768078 × 1000× meter of water @ 4°C (mH2O)
= 1.422333772221187× meter of water @ 4°C (mH2O)
With 0.00014503768078 is the ratio between the base units kilopound per square inch (ksi) and kilopascal (kPa).
Let's convert 5 meter of water @ 4°C (mH2O) to pound per square inch (psi).
Using the formula:
5 × 1.422333772221187 = 7.111668861105935
Therefore, 5 meter of water @ 4°C (mH2O) is equal to 7.111668861105935 pound per square inch (psi).
How many meters of water @ 4°c are in one pound per square inch? One pound per square inch (psi) contains 0.70306985570507151526 meters of water @ 4°C (mH2O) — the inverse of the factor above. Multiplying by 1.422333772221187 takes you from meters of water @ 4°c to pounds per square inch; multiplying by 0.70306985570507151526 brings you back.
Put in words: one meter of water @ 4°c equals 1.422333772221187 pounds per square inch, so the meter of water @ 4°c is the larger unit of this pair. Converting between them never changes the amount of pressure being measured — only the size of the unit you count it in.
A meter of water @ 4°C (mH2O) is a metric unit used to measure pressure.
It is precisely defined as 9.80665 kilopascals (kPa).
The specific temperature of 4°C (39.2°F) is key because this is the point where pure water is at its heaviest or most dense (approximately 999.972 kg/m3).
Using this temperature provides a stable and reliable standard for defining pressure.
This precision is essential in scientific and engineering fields like hydraulics and fluid mechanics, ensuring that measurements of pressure head are consistent and accurate across different applications and locations.
The unit "meter of water" (mH2O) is frequently used in civil engineering, hydrology, and irrigation to measure water levels and pressure.
It provides an intuitive way to express the pressure exerted by a column of water, such as the water level in a reservoir, dam, or groundwater well. This measurement is sometimes referred to as the 'piezometric head'.
It is also commonly used to specify the performance of pumps, indicating the height to which a pump can lift water.
For practical use, it's often helpful to know how mH2O converts to other common pressure units.
One mH2O is equal to:
These conversion factors allow engineers and scientists to easily translate pressure specifications between different international and imperial systems.
A pound per square inch (PSI) is a unit of pressure commonly used in the imperial system (which is standard in the United States).
It measures the amount of force applied over a single square inch of area.
PSI is a critical measurement for safety and performance in many common items, including:
Vehicle Tires: Proper tire pressure (PSI) ensures optimal handling, fuel efficiency, and tire life. You can find the recommended level on a sticker inside the driver's door.
Home Water Pressure: Affects everything from shower performance to how well appliances like dishwashers and washing machines function.
Sports Equipment: Items like footballs, basketballs, and soccer balls require a specific PSI to perform correctly and safely.
Tools: Air compressors, pressure washers, and paint sprayers all have specific PSI ratings for safe and effective operation.
While PSI is standard in the imperial system, scientific and international contexts use metric (SI) units like the Pascal (Pa) and the bar.
PSI to Pascal (Pa): The official SI unit for pressure.
1 PSI ≈ 6,894.76 Pascals (or 6.895 kilopascals, kPa).
PSI to Bar: A common unit in automotive and weather contexts. 1 bar is roughly equal to atmospheric pressure at sea level.
1 PSI ≈ 0.0689 bar.
The term "PSI" can be specified further to give more context:
PSIG (Pound-force per square inch gauge): Measures pressure relative to the surrounding atmospheric pressure. This is the most common measurement, used by a standard tire gauge.
PSIA (Pound-force per square inch absolute): Measures pressure relative to a perfect vacuum (absolute zero pressure).
The formula is: PSIA = PSIG + local atmospheric pressure.
PSID (Pound-force per square inch differential): Measures the difference in pressure between two separate points in a system, such as across a filter or valve.
Here are some quick reference conversions from meter of water @ 4°C (mH2O) to pound per square inch (psi):
| meters of water @ 4°C | pounds per square inch |
|---|---|
| 0.000001 mH2O | 0.000001422333772221187 psi |
| 0.001 mH2O | 0.001422333772221187 psi |
| 0.1 mH2O | 0.1422333772221187 psi |
| 1 mH2O | 1.422333772221187 psi |
| 2 mH2O | 2.844667544442374 psi |
| 3 mH2O | 4.267001316663561 psi |
| 4 mH2O | 5.689335088884748 psi |
| 5 mH2O | 7.111668861105935 psi |
| 6 mH2O | 8.534002633327122 psi |
| 7 mH2O | 9.956336405548309 psi |
| 8 mH2O | 11.378670177769496 psi |
| 9 mH2O | 12.801003949990683 psi |
| 10 mH2O | 14.22333772221187 psi |
| 20 mH2O | 28.44667544442374 psi |
| 30 mH2O | 42.67001316663561 psi |
| 40 mH2O | 56.89335088884748 psi |
| 50 mH2O | 71.11668861105935 psi |
| 100 mH2O | 142.2333772221187 psi |
| 1000 mH2O | 1422.333772221187 psi |
| 10000 mH2O | 14223.33772221187 psi |
For all Pressure converters, choose units using the From/To dropdowns above.