›› Convert millimeter water [4 °C] to attopascal

mm H2O

›› More information from the unit converter

How many mm H2O in 1 attopascal? The answer is 1.0197162129779E-19.
We assume you are converting between millimeter water [4 °C] and attopascal.
You can view more details on each measurement unit:
mm H2O or attopascal
The SI derived unit for pressure is the pascal.
1 pascal is equal to 0.10197162129779 mm H2O, or 1.0E+18 attopascal.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between millimeters water and attopascals.
Type in your own numbers in the form to convert the units!

›› Quick conversion chart of mm H2O to attopascal

1 mm H2O to attopascal = 9.80665E+18 attopascal

2 mm H2O to attopascal = 1.96133E+19 attopascal

3 mm H2O to attopascal = 2.941995E+19 attopascal

4 mm H2O to attopascal = 3.92266E+19 attopascal

5 mm H2O to attopascal = 4.903325E+19 attopascal

6 mm H2O to attopascal = 5.88399E+19 attopascal

7 mm H2O to attopascal = 6.864655E+19 attopascal

8 mm H2O to attopascal = 7.84532E+19 attopascal

9 mm H2O to attopascal = 8.825985E+19 attopascal

10 mm H2O to attopascal = 9.80665E+19 attopascal

›› Want other units?

You can do the reverse unit conversion from attopascal to mm H2O, or enter any two units below:

Enter two units to convert


›› Common pressure conversions

mm H2O to millimeter mercury
mm H2O to millimeter of water
mm H2O to kilogram-force/square millimeter
mm H2O to inch water
mm H2O to pieze
mm H2O to dekabar
mm H2O to decipascal
mm H2O to terabar
mm H2O to barad
mm H2O to pascal

›› Definition: Attopascal

The SI prefix "atto" represents a factor of 10-18, or in exponential notation, 1E-18.

So 1 attopascal = 10-18 pascals.

The definition of a pascal is as follows:

The pascal (symbol Pa) is the SI unit of pressure.It is equivalent to one newton per square metre. The unit is named after Blaise Pascal, the eminent French mathematician, physicist and philosopher.

›› Metric conversions and more

ConvertUnits.com provides an online conversion calculator for all types of measurement units. You can find metric conversion tables for SI units, as well as English units, currency, and other data. Type in unit symbols, abbreviations, or full names for units of length, area, mass, pressure, and other types. Examples include mm, inch, 100 kg, US fluid ounce, 6'3", 10 stone 4, cubic cm, metres squared, grams, moles, feet per second, and many more!