Meter of water column.
Meter of waters to Attopascals Converter — mH2O to aPa
Convert Meter of water (mH2O) to Attopascal (aPa) using the exact conversion factor (1 meter of water = 9.80665e+21 attopascal). See the formula, worked examples, and conversion table.
Meter of waters to Attopascals 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.
Attopascal is 1e-18 pascal units.
Result = input x 9806.65 / 1e-18.
Stress Pressure units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Meter of waters to Attopascals
Meter of water and Attopascal 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: Meter of water column, and attopascal is 1e-18 pascal units.
Formula
attopascals = meter of waters × 9.80665e+21
This factor comes from each unit's defined relationship to the category's base unit: 1 meter of water equals 9806.65 base units, and 1 attopascal equals 1e-18 base units, so dividing one by the other gives the direct meter of water-to-attopascal factor of 9.80665e+21.
Simple example
1 mH2O × 9.80665e+21 = 9.80665e+21 aPa
1 meter of water = 9.80665e+21 attopascals.
Real-world example
100 mH2O × 9.80665e+21 = 9.80665e+23 aPa
100 meter of waters = 9.80665e+23 attopascals.
Conversion table
| Meter of water (mH2O) | Attopascal (aPa) |
|---|---|
| 1 mH2O | 9.80665e+21 aPa |
| 10 mH2O | 9.80665e+22 aPa |
| 50 mH2O | 4.903325e+23 aPa |
| 100 mH2O | 9.80665e+23 aPa |
| 500 mH2O | 4.903325e+24 aPa |
| 1,000 mH2O | 9.80665e+24 aPa |
Reverse conversion: Attopascal to Meter of water
9.80665e+21 aPa × 1.019716e-22 = 1 mH2O
9.80665e+21 attopascals = 1 meter of waters.
meter of waters = attopascals × 1.019716e-22
For a page dedicated to this direction, see Attopascal to Meter of water.
Understanding the Meter of water (mH2O)
Meter of water column.
Understanding the Attopascal (aPa)
Attopascal is 1e-18 pascal units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many attopascals are in 1 meter of water?
1 meter of water equals 9.80665e+21 attopascals, using the exact defined conversion factor rather than an estimate.
How do I convert meter of water to attopascal?
Multiply the meter of water value by 9.80665e+21. The converter above does this instantly to whatever precision you set.
How do I convert attopascal back to meter of water?
Use the reverse factor: 1 attopascal equals 1.019716e-22 meter of waters. You can also use the swap control in the converter above to flip the direction instantly.
What is a meter of water?
Meter of water (mH2O) is a unit of engineering.
What is a attopascal?
Attopascal (aPa) is a unit of engineering.
Is the meter of water to attopascal conversion exact?
Yes. Both meter of water and attopascal are defined by fixed standards rather than physical artifacts, so the factor of 9.80665e+21 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.