Standard atmosphere to Pascal Converter
Enter the value that you want to convert Standard atmosphere (atm) to pascal (Pa) or pascal to Standard atmosphere.Also written as ATM to PA conversion.
1 Standard atmosphere = 101325.0000000 pascal
Formula: pascal = Standard atmosphere value × 101325.0000000
ATM to PA — Standard atmosphere to pascal
10 Standard atmosphere = 1013250.00000 pascal
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Why Convert Standard atmosphere to Pascal?
About the Standard atmosphere
Standard atmosphere (atm) is a unit of pressure measurement. 1 Standard atmosphere is equal to 101325.0000000 pascal.
About the Pascal
Pascal (Pa) is a unit of pressure measurement. 1 pascal is equal to 0.0000099 Standard atmosphere.
Pressure Units Across Industries
Pressure measurements vary dramatically by industry. Meteorologists report in millibars or hectopascals, tire shops use PSI, scuba divers think in atmospheres or bar, vacuum engineers work in torr, and hydraulic systems specify in megapascals. A single industrial plant might encounter all these units across different equipment manuals, safety datasheets, and regulatory standards from different countries.
Standard atmosphere to pascal metric conversion table
| 0.01 atm | = | 1013.25000 Pa |
| 0.1 atm | = | 10132.50000 Pa |
| 1 atm | = | 101325.00000 Pa |
| 2 atm | = | 202650.00000 Pa |
| 3 atm | = | 303975.00000 Pa |
| 4 atm | = | 405300.00000 Pa |
| 5 atm | = | 506625.00000 Pa |
| 6 atm | = | 607950.00000 Pa |
| 7 atm | = | 709275.00000 Pa |
| 8 atm | = | 810600.00000 Pa |
| 9 atm | = | 911925.00000 Pa |
| 10 atm | = | 1013250.00000 Pa |
| 11 atm | = | 1114575.00000 Pa |
| 12 atm | = | 1215900.00000 Pa |
| 13 atm | = | 1317225.00000 Pa |
| 14 atm | = | 1418550.00000 Pa |
| 15 atm | = | 1519875.00000 Pa |
| 16 atm | = | 1621200.00000 Pa |
| 17 atm | = | 1722525.00000 Pa |
| 18 atm | = | 1823850.00000 Pa |
| 19 atm | = | 1925175.00000 Pa |
| 20 atm | = | 2026500.00000 Pa |
| 30 atm | = | 3039750.00000 Pa |
| 40 atm | = | 4053000.00000 Pa |
| 50 atm | = | 5066250.00000 Pa |
| 60 atm | = | 6079500.00000 Pa |
| 70 atm | = | 7092750.00000 Pa |
| 80 atm | = | 8106000.00000 Pa |
| 90 atm | = | 9119250.00000 Pa |
| 100 atm | = | 10132500.00000 Pa |
| 200 atm | = | 20265000.00000 Pa |
| 300 atm | = | 30397500.00000 Pa |
| 400 atm | = | 40530000.00000 Pa |
| 500 atm | = | 50662500.00000 Pa |
| 600 atm | = | 60795000.00000 Pa |
| 700 atm | = | 70927500.00000 Pa |
| 800 atm | = | 81060000.00000 Pa |
| 900 atm | = | 91192500.00000 Pa |
| 1000 atm | = | 101325000.00000 Pa |
How to Convert ATM to PA (Standard atmosphere to Pascal)?
We can convert Standard atmosphere to pascal by using an example.
Example:
Convert 20 Standard atmosphere to Pascal?
We know 1 Standard atmosphere = 101325.0000000 pascal; 1 Pascal = 0.0000099 Standard atmosphere.
20 Standard atmosphere = ___Pa
20 × 101325.0000000 = 2026500.00000 Pa (we know 1 Standard atmosphere = 101325.0000000 pascal)
Answer:
20 Standard atmosphere = 2026500.00000 pascal
How to Convert Atmospheres to Pascal (Step-by-Step)
Converting standard atmospheres to pascals is fundamental in chemistry and physics, particularly when applying the ideal gas law with SI units. The conversion is exact by definition: 1 atm = 101,325 Pa.
- Write down the pressure value in atmospheres (atm).
- Multiply the atm value by 101,325.
- The result is the equivalent pressure in pascals (Pa).
- For partial atmospheres, the multiplication still applies: 0.5 atm = 50,662.5 Pa.
Common Atmosphere to Pascal Conversions
Reference values for gas law calculations, laboratory work, and physics problems.
| Standard atmosphere | Pascal |
|---|---|
| 0.5 atm | 50,662.5 Pa |
| 1.0 atm | 101,325 Pa |
| 1.5 atm | 151,987.5 Pa |
| 2.0 atm | 202,650 Pa |
| 3.0 atm | 303,975 Pa |
| 5.0 atm | 506,625 Pa |
| 10.0 atm | 1,013,250 Pa |
Solved Examples: Atmospheres to Pascal
Question 1: A gas law problem states pressure is 2.5 atm. Convert to Pa for use with R = 8.314 J/(mol·K).
Solution:
Pressure in Pa = Pressure in atm × 101,325
= 2.5 × 101,325
= 253,312.5 Pa
Answer: 2.5 atm = 253,312.5 Pa — now compatible with R = 8.314 Pa·L/(mol·K) in PV = nRT.
Question 2: Standard atmospheric pressure is 1 atm. Verify the pascal equivalent.
Solution:
Pressure in Pa = 1 × 101,325
= 101,325 Pa
Answer: 1 atm = 101,325 Pa (= 101.325 kPa) — this is the SI definition of standard atmosphere.
Question 3: A reaction vessel operates at 0.85 atm. Express in Pa.
Solution:
Pressure in Pa = 0.85 × 101,325
= 86,126.25 Pa
Answer: 0.85 atm = 86,126 Pa — below atmospheric, indicating slight vacuum conditions.
Question 4: An autoclave operates at 3.5 atm. What is the steam pressure in Pa?
Solution:
Pressure in Pa = 3.5 × 101,325
= 354,637.5 Pa
Answer: 3.5 atm = 354,638 Pa ≈ 355 kPa — typical for medical instrument sterilization.
Practice Questions: Atmospheres to Pascal
Try solving these on your own to test your understanding:
- Convert 4 atm to Pa. (Answer: 405,300 Pa)
- Partial pressure of O₂ at sea level is 0.21 atm. Express in Pa. (Answer: 21,278 Pa)
- Convert 0.1 atm to Pa. (Answer: 10,132.5 Pa)
- A pressure cooker operates at 2.0 atm absolute. What is this in Pa? (Answer: 202,650 Pa)
- Convert 15 atm to Pa. (Answer: 1,519,875 Pa)
The Definition of Standard Atmosphere
The standard atmosphere (atm) is defined as exactly 101,325 Pa. This definition was adopted in 1954 by the 10th General Conference on Weights and Measures (CGPM). It approximates sea-level air pressure at 15°C latitude 45°. Before this standardization, "atmosphere" had slightly different values in different countries. The exact definition ensures reproducibility in scientific measurements and gas law calculations worldwide.
Gas Law Unit Consistency: atm vs Pa
The ideal gas law PV = nRT requires consistent units. With P in Pa, V in m³, n in mol, and T in K, use R = 8.314 J/(mol·K). With P in atm, V in L, use R = 0.08206 L·atm/(mol·K). Mixing units (e.g., Pa with liters) produces wrong answers. When a problem gives pressure in atm but asks for SI results, convert to Pa first: multiply by 101,325. This avoids the common error of using the wrong R value.
Partial Pressures and Dalton's Law in Pa
Dalton's Law states total pressure equals the sum of partial pressures. At 1 atm (101,325 Pa), dry air partial pressures are: N₂ = 0.7808 atm = 79,119 Pa, O₂ = 0.2095 atm = 21,228 Pa, Ar = 0.0093 atm = 942 Pa, CO₂ = 0.0004 atm = 41 Pa. Expressing partial pressures in Pa is standard in atmospheric chemistry and respiratory physiology (alveolar gas calculations).
Key Takeaways
- Multiply atm by 101,325 to get pascals (exact definition).
- 1 atm = 101,325 Pa = 101.325 kPa = 1013.25 hPa.
- STP in chemistry: 0°C (273.15 K) and 101,325 Pa (1 atm).
- Use R = 8.314 J/(mol·K) when pressure is in Pa; R = 0.08206 when in atm.
- Partial pressures in Pa enable direct use in SI thermodynamic calculations.
- The atm is a defined constant, not a measured value.
Standard atmosphere to Pascal Conversion Formula
pascal = Standard atmosphere × 101325.0000000
1 Standard atmosphere = 101325.0000000 pascal
1 pascal = 0.0000099 Standard atmosphere
Reverse: Standard atmosphere = pascal × 0.0000099
Frequently Asked Questions
How many pascal are in 1 Standard atmosphere?
There are 101325.0000000 pascal in 1 Standard atmosphere. To convert Standard atmosphere to pascal, multiply the value by 101325.0000000.
How do I convert Standard atmosphere to pascal?
Multiply your Standard atmosphere value by 101325.0000000 to get the equivalent in pascal. For example, 5 Standard atmosphere = 5 × 101325.0000000 = 506625.00000 pascal.
How do I convert pascal to Standard atmosphere?
Multiply your pascal value by 0.0000099 to get the equivalent in Standard atmosphere. Alternatively, divide by 101325.0000000.
What is 10 Standard atmosphere in pascal?
10 Standard atmosphere is equal to 1013250.00000 pascal.
What is 100 Standard atmosphere in pascal?
100 Standard atmosphere is equal to 10132500.00000 pascal.