Attopascal is 1e-18 pascal units.
Attopascals to Meter of waters Converter — aPa to mH2O
Convert Attopascal (aPa) to Meter of water (mH2O) using the exact conversion factor (1 attopascal = 1.019716e-22 meter of water). See the formula, worked examples, and conversion table.
Attopascals to Meter of waters converter
Converter
Engineering Converter
Convert common stress, force, torque, power, and energy units used in engineering.
Context values
Some unit families need one extra value for a physically accurate result.
Meter of water column.
Result = input x 1e-18 / 9806.65.
Stress Pressure units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Attopascals to Meter of waters
Attopascal and Meter of water both measure a quantity used in structural or mechanical engineering — commonly stress, pressure, force, torque, power, or energy — where converting between the unit conventions used in different regions, industries, or equipment specifications is a routine part of design work. Specifically: Attopascal is 1e-18 pascal units, and meter of water column.
Formula
meter of waters = attopascals × 1.019716e-22
This factor comes from each unit's defined relationship to the category's base unit: 1 attopascal equals 1e-18 base units, and 1 meter of water equals 9806.65 base units, so dividing one by the other gives the direct attopascal-to-meter of water factor of 1.019716e-22.
Simple example
1 aPa × 1.019716e-22 = 1.019716e-22 mH2O
1 attopascal = 1.019716e-22 meter of waters.
Real-world example
100 aPa × 1.019716e-22 = 1.019716e-20 mH2O
100 attopascals = 1.019716e-20 meter of waters.
Conversion table
| Attopascal (aPa) | Meter of water (mH2O) |
|---|---|
| 1 aPa | 1.019716e-22 mH2O |
| 10 aPa | 1.019716e-21 mH2O |
| 50 aPa | 5.098581e-21 mH2O |
| 100 aPa | 1.019716e-20 mH2O |
| 500 aPa | 5.098581e-20 mH2O |
| 1,000 aPa | 1.019716e-19 mH2O |
Reverse conversion: Meter of water to Attopascal
1.019716e-22 mH2O × 9.80665e+21 = 0.9999997911 aPa
1.019716e-22 meter of waters = 0.9999997911 attopascals.
attopascals = meter of waters × 9.80665e+21
For a page dedicated to this direction, see Meter of water to Attopascal.
Understanding the Attopascal (aPa)
Attopascal is 1e-18 pascal units.
Understanding the Meter of water (mH2O)
Meter of water column.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many meter of waters are in 1 attopascal?
1 attopascal equals 1.019716e-22 meter of waters, using the exact defined conversion factor rather than an estimate.
How do I convert attopascal to meter of water?
Multiply the attopascal value by 1.019716e-22. The converter above does this instantly to whatever precision you set.
How do I convert meter of water back to attopascal?
Use the reverse factor: 1 meter of water equals 9.80665e+21 attopascals. You can also use the swap control in the converter above to flip the direction instantly.
What is a attopascal?
Attopascal (aPa) is a unit of engineering.
What is a meter of water?
Meter of water (mH2O) is a unit of engineering.
Is the attopascal to meter of water conversion exact?
Yes. Both attopascal and meter of water are defined by fixed standards rather than physical artifacts, so the factor of 1.019716e-22 used above is exact to as many digits as you choose to display.
Why do engineering unit conventions vary so much by region and industry?
Pressure, force, and stress can be expressed in metric (pascal, newton), US customary (psi, pound-force), or older and industry-specific units (atmosphere, torr, kip) depending on the country, industry, and even the equipment manufacturer, which is why engineers routinely need to convert between them when working across specs from different sources.