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

Pressure Converter

29 units available

Decimals:

From

To

1.000000e-4

1 mmH2O = 1.000000e-4 at

Formula:

at = mmH2O × 0.0001

With your value: 1 mmH2O = 1.000000e-4 at

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

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

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

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

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.

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

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

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

To convert from mmH2O (4°C) (mmH2O) to Atmosphere (tech) (at), multiply the value by 1.000000e-4.

Formula: at = mmH2O × 0.0001

Reverse: mmH2O = at × 10,000

Step-by-Step Example

Start with your value in mmH2O (4°C). For example: 5 mmH2O
Multiply by the conversion factor: 5 x 1.000000e-4
The result is: 0.0005 at

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.

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.

Frequently Asked Questions

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

There are exactly 1.000000e-4 Atmosphere (tech) in 1 mmH2O (4°C). This means the conversion factor from mmH2O (4°C) to Atmosphere (tech) is 1.000000e-4.

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

The formula to convert mmH2O (4°C) to Atmosphere (tech) is: at = mmH2O × 0.0001. For example, to convert 10 mmH2O (4°C) to Atmosphere (tech), you would multiply 10 by 1.000000e-4.

What is a mmH2O (4°C)?