990 Pascals to Standard Atmospheres

990 Pa ≈ 0.0097705 atm

Calculation: atm = 990 Pa × 9.86923 × 10⁻⁶ ≈ 0.0097705 atm

Pascal to Standard Atmosphere Converter

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How much pressure is 990 Pa?

0.144 psi (0.990 kPa) is comparable to a laboratory vacuum, such as inside a glass bell jar.

What does 990 Pa look like?

Illustration of a vacuum bell jar
0.144 psi (0.990 kPa) is comparable to a laboratory vacuum, such as inside a glass bell jar.

How to Convert Pascal to Standard Atmosphere

1 pascal = 9.86923 × 10-6 standard atmospheres exact

Standard Atmosphere = Pascal × 9.86923 × 10-6

Example: 990 Pa × 9.86923 × 10-6 = 0.0097705 atm

Reverse Conversion

To convert standard atmospheres back to pascals:

  • Remember, 1 standard atmosphere equals 101325 pascals.
  • To convert 0.0097705 atm to Pa, multiply 0.0097705 x 101325, resulting in 990 Pa.

exact This conversion factor is exact by international definition.

990 Pa is also equal to:

  • 0.99 kPa
  • 0.0099 bar
  • 0.14359 psi
About these units

Pascal: SI derived unit of pressure equal to one newton per square meter (N/m²).

Standard atmosphere: Standard unit of atmospheric pressure defined as exactly 101,325 pascals.

Frequently Asked Questions

How much is 990 pascals in standard atmospheres?

990 pascals equals 0.0097705 standard atmospheres. This is calculated by multiplying 990 by the conversion factor 9.86923 × 10⁻⁶.

What does 990 pascals look like in standard atmospheres?

990 pascals (0.0097705 standard atmospheres) is low pressure — sound pressure or gentle airflow.

How do you calculate 990 pascals to standard atmospheres?

Multiply 990 by the conversion factor 9.86923 × 10⁻⁶. The calculation is 990 × 9.86923 × 10⁻⁶ = 0.0097705 standard atmospheres. This factor is defined by international measurement standards.

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990 pascals = 0.00977054 standard atmospheres
990 pascals = 0.00977054 standard atmospheres — conversion chart

Nearby Conversions

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For general conversions between pascals and standard atmospheres, see the pascals to standard atmospheres converter.

Also convert Pascals to:

Conversion factors verified against NIST, BIPM, ISO 80000-4 1 atm = 101 325 Pa by definition (BIPM). Last reviewed: March 2026
Adilson Fernandes By Adilson Fernandes
Tiago Fernandes Reviewed by Tiago Fernandes

All unit conversions on CoolConversion use conversion factors defined or documented by internationally recognised standards bodies (such as ISO and NIST), including both SI and non-SI units.