Atmosphere (tech) to mmH2O (4°C) Converter

Pressure Converter

29 units available

Decimals:

From

To

10,000

1 at = 10,000 mmH2O

Formula:

mmH2O = at × 10,000

With your value: 1 at = 10,000 mmH2O

Other Atmosphere (tech) to mmH2O (4°C) conversions

2 at to mmH2O 3 at to mmH2O 4 at to mmH2O 5 at to mmH2O 6 at to mmH2O 7 at to mmH2O 8 at to mmH2O

Atmosphere (tech) to mmH2O (4°C) Conversion Table

Atmosphere (tech) (at)	mmH2O (4°C) (mmH2O)
0.5	5,000
1	10,000
2	20,000
5	50,000
10	100,000
15	150,000
20	200,000
25	250,000
50	500,000
100	1,000,000
250	2,500,000
500	5,000,000
1000	10,000,000

mmH2O (4°C) to Atmosphere (tech) Conversion Table

mmH2O (4°C) (mmH2O)	Atmosphere (tech) (at)
0.5	5.000000e-5
1	1.000000e-4
2	0.0002
5	0.0005
10	0.001
15	0.0015
20	0.002
25	0.0025
50	0.005
100	0.01
250	0.025
500	0.05
1000	0.1

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

Atmosphere (tech) (at)

Pressure

Exact conversion

Derived from the pascal (1 Pa = 1 N/m²). The standard atmosphere is exactly 101 325 Pa.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

mmH2O (4°C) (mmH2O)

Pressure

Exact conversion

Derived from the pascal (1 Pa = 1 N/m²). The standard atmosphere is exactly 101 325 Pa.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

How to Convert Atmosphere (tech) to mmH2O (4°C)

To convert from Atmosphere (tech) (at) to mmH2O (4°C) (mmH2O), multiply the value by 10,000.

Formula: mmH2O = at × 10,000

Reverse: at = mmH2O × 0.0001

Step-by-Step Example

Start with your value in Atmosphere (tech). For example: 5 at
Multiply by the conversion factor: 5 x 10,000
The result is: 50,000 mmH2O

About Atmosphere (tech)

The atmosphere (tech) (at) is a unit of pressure and stress. One atmosphere (tech) equals 98066.5 pascals. UnitConvertLab converts it against every other pressure unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: pressure calculations, engineering and science, education.

About mmH2O (4°C)

The mmh2o (4°c) (mmH2O) is a unit of pressure and stress. One mmh2o (4°c) equals 9.80665 pascals. UnitConvertLab converts it against every other pressure unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: pressure calculations, engineering and science, education.

Frequently Asked Questions

How many mmH2O (4°C) are in 1 Atmosphere (tech)?

There are exactly 10,000 mmH2O (4°C) in 1 Atmosphere (tech). This means the conversion factor from Atmosphere (tech) to mmH2O (4°C) is 10,000.

What is the formula to convert Atmosphere (tech) to mmH2O (4°C)?

The formula to convert Atmosphere (tech) to mmH2O (4°C) is: mmH2O = at × 10,000. For example, to convert 10 Atmosphere (tech) to mmH2O (4°C), you would multiply 10 by 10,000.

What is a Atmosphere (tech)?