Convert Standard Atmospheres (atm) to Pascals (Pa)
1 standard atmosphere equals 101325 pascals.
Standard Atmosphere to Pascal Converter
How to Convert Standard Atmosphere to Pascal
1 standard atmosphere = 101325 pascals exact
Pascal = Standard Atmosphere × 101325
Example: 1 atm × 101325 = 101325 Pa
Reverse Conversion
To convert pascals back to standard atmospheres:
- Remember, 1 pascal equals 9.86923 × 10-6 standard atmospheres.
- To convert 101325 Pa to atm, multiply
101325 x 9.86923 × 10-6, resulting in1 atm.
exact This conversion factor is exact by international definition.
Common Standard Atmosphere to Pascal Conversions
| Standard Atmosphere | Pascal | Actions |
|---|---|---|
| 1 standard atmosphere | 101325 pascals | |
| 5 standard atmospheres | 506625 pascals | |
| 10 standard atmospheres | 1013250 pascals | |
| 25 standard atmospheres | 2533130 pascals |
| Standard Atmosphere | Pascal | Actions |
|---|---|---|
| 50 standard atmospheres | 5066250 pascals | |
| 100 standard atmospheres | 1.01325 × 107 pascals | |
| 500 standard atmospheres | 5.06625 × 107 pascals | |
| 1000 standard atmospheres | 1.01325 × 108 pascals |
Standard atmospheres to pascals Conversion Table
Reference table with common standard atmospheres to pascals conversions. All values calculated with high precision.
Standard Atmospheres to Pascals Table
0.0001 to 12
Standard Atmospheres to Pascals Table
1 to 100000
Pascals to Standard Atmospheres Table
100 to 500000
Pascals to Standard Atmospheres Table
1000000 to 1 × 1011
Definition of Standard Atmosphere
Atmosphere: Standard Atmospheric Pressure
The standard atmosphere (atm) is a unit of pressure defined as exactly 101,325 pascals. It represents the typical atmospheric pressure at sea level under standard conditions. The atmosphere is commonly used as a reference point for pressure measurements and is particularly important in chemistry, physics, and meteorology for defining standard conditions.
Conversions to Other Units of Measurement:
- Pascal (Pa): 1 atmosphere equals exactly 101,325 pascals. This is the definition of the standard atmosphere.
- Bar: 1 atmosphere equals exactly 1.01325 bar. The bar was designed to be close to atmospheric pressure. For example, 2 atm equals 2.0265 bar.
- PSI: 1 atmosphere equals approximately 14.6959 psi. This is a fundamental conversion for many applications. Standard atmospheric pressure is often approximated as 14.7 psi.
- Torr: 1 atmosphere equals exactly 760 torr. This relationship comes from the original definition of the torr based on mercury column height.
- Millibar (mbar): 1 atmosphere equals exactly 1013.25 millibar. This is commonly used in meteorology for weather maps.
The atmosphere provides an intuitive reference for pressure, being directly related to the air pressure we experience daily at sea level.
- Definition
- Standard unit of atmospheric pressure defined as exactly 101,325 pascals.
- Exact factor
- 1 atm = 101,325 Pa (exact)
- Common equivalents
- 1 atm = 760 torr (exact by definition)
- 1 atm = 1.01325 bar (exact)
- 1 atm ≈ 14.6959 psi
- Sources
Definition of Pascal
Pascal: The SI Unit of Pressure
The pascal (Pa) is the SI derived unit of pressure, defined as one newton per square meter (N/m²). Named after the French mathematician and physicist Blaise Pascal, it is used extensively in scientific, engineering, and meteorological applications. The pascal is a relatively small unit, so larger multiples like kilopascal (kPa) and megapascal (MPa) are commonly used in practice.
Conversions to Other Units of Measurement:
- Bar: 1 pascal equals 0.00001 bar (or 1 bar = 100,000 Pa). This conversion is frequently used in industrial applications. For example, standard atmospheric pressure (101,325 Pa) equals approximately 1.01325 bar.
- PSI (Pound per Square Inch): 1 pascal equals approximately 0.000145038 psi. This conversion is essential for interfacing with equipment using imperial measurements. For example, 100,000 Pa equals approximately 14.5 psi.
- Atmosphere (atm): 1 pascal equals approximately 9.8692×10⁻⁶ atm. Standard atmospheric pressure is defined as exactly 101,325 Pa or 1 atm.
- Torr: 1 pascal equals approximately 0.00750062 torr. This conversion is commonly used in vacuum technology. For example, 133.322 Pa equals 1 torr.
- Millibar (mbar): 1 pascal equals 0.01 millibar. This conversion is frequently used in meteorology. For example, standard atmospheric pressure equals 1013.25 mbar.
The pascal is fundamental to pressure measurement, providing a standardized unit for scientific calculations and engineering specifications.
- Definition
- SI derived unit of pressure equal to one newton per square meter (N/m²).
- Exact factor
- 1 Pa = 1 N/m² = 1 kg/(m·s²) (exact)
- Common equivalents
- 1 Pa = 0.00001 bar (exact)
- 1 Pa = 0.01 mbar (exact)
- 1 Pa ≈ 0.000145038 psi
- Sources
About the Standard Atmosphere
Facts & Uses
- 1 atm = 101,325 Pa exactly — the standard reference for sea-level atmospheric pressure, defined by the 10th CGPM in 1954.
- Used as a reference pressure in chemistry, physics, and meteorology. Many gas calculations use atm as the unit of choice.
- Defines standard temperature and pressure (STP) in older chemistry conventions: 0 °C and 1 atm. (IUPAC since 1982 uses 100 kPa instead.)
- Reference for scuba and diving tables: 1 atm of pressure increase for every 10 m of seawater (or 33 ft).
Curiosities
- The standard atmosphere is an arbitrary reference — actual sea-level pressure varies daily by ±50 hPa based on weather systems.
- The 10th CGPM (1954) chose 101,325 Pa exactly to align with the historical definition based on a 760 mm column of mercury at 0 °C and standard gravity.
- The pressure at the top of Mount Everest is about 0.33 atm (33.7 kPa) — only one-third of sea level, which is why supplemental oxygen is essential above 8000 m.
- Approximate equivalents: 1 atm = 14.696 psi = 1.01325 bar = 760 mmHg = 760 torr.
Sources
About the Pascal
Facts & Uses
- SI derived unit of pressure: 1 Pa = 1 N/m². Named after Blaise Pascal (1623-1662), the French mathematician and physicist.
- Universal in scientific publications, weather data (hectopascals on barometric charts), and engineering specifications.
- The pascal is a very small unit for everyday pressures — atmospheric pressure is ~101,325 Pa, so weather forecasts use hectopascals (hPa) or kilopascals (kPa).
- Used in fluid mechanics, vacuum measurements, materials science (stress and strain), and tire pressure in metric markets.
Curiosities
- The pascal was adopted as the SI unit of pressure at the 14th CGPM in 1971, replacing the older mechanical units like dyne/cm² (CGS) and lbf/in² (imperial).
- 1 Pa is roughly the pressure exerted by a thin layer of paper resting on a tabletop — about 0.0000099 atmospheres.
- The millibar (mbar), traditionally used in meteorology, equals exactly 1 hPa (100 Pa). Most modern weather services have switched to hPa for SI compatibility.
- Approximate equivalents: 1 Pa ≈ 0.000145 psi; 1 atm = 101,325 Pa = 1013.25 hPa = 14.696 psi.
Sources
Frequently Asked Questions
How many pascals are in one standard atmosphere?
One standard atmosphere equals 101325 pascals. To convert, multiply the standard atmosphere value by 101325. For the reverse, divide the pascal value by 101325 (or multiply by 9.86923 × 10-6).
What is 1 standard atmosphere in pascals?
1 standard atmosphere = 101330 pascals. This is one of the most commonly searched conversions for this pair.
How precise is the standard atmosphere-to-pascal conversion?
The factor 101325 is accurate to 6 significant figures, derived from international measurement standards. Our calculator uses full precision internally.
Looking for the reverse? Convert Pascal to Standard Atmosphere
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