Atmosphere to Pascal Converter
Convert atmosphere pascal between units instantly. Includes conversion tables, common equivalents, and calculation formulas.
Reviewed for accuracy by Manoj Kumar, Mathematics Educator
Atmosphere to Pascal Converter
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Formula: Pa = atm x 101325 | 1 bar = 100000 Pa | 1 PSI = 6894.76 Pa
Worked example โ 32 PSI = 220,632 Pa = 2.21 bar
Formula
Pa = atm x 101325 | 1 bar = 100000 Pa | 1 PSI = 6894.76 Pa
One standard atmosphere equals exactly 101,325 pascals. All pressure conversions use the pascal as the base SI unit. Key relationships: 1 bar = 100,000 Pa, 1 PSI = 6,894.76 Pa, 1 mmHg (torr) = 133.322 Pa, 1 inHg = 3,386.39 Pa. The pascal is defined as one newton per square meter.
Worked Examples
Example 1: Tire Pressure Conversion
Problem:Convert 32 PSI tire pressure to pascals and bar.
Solution:Pascals: 32 x 6,894.76 = 220,632.32 Pa Kilopascals: 220,632.32 / 1000 = 220.63 kPa Bar: 220,632.32 / 100,000 = 2.2063 bar Atmospheres: 220,632.32 / 101,325 = 2.178 atm
Result:32 PSI = 220,632 Pa = 2.21 bar
Example 2: Weather Pressure
Problem:A barometer reads 760 mmHg. What is this in pascals and atmospheres?
Solution:Pascals: 760 x 133.322 = 101,324.72 Pa Atmospheres: 101,324.72 / 101,325 = 1.0000 atm Bar: 101,324.72 / 100,000 = 1.0132 bar
Result:760 mmHg = 101,325 Pa = 1.0 atm (standard pressure)
Frequently Asked Questions
How many pascals are in one atmosphere?
One standard atmosphere (atm) equals exactly 101,325 pascals (Pa) or 101.325 kilopascals (kPa). This value was defined by the International Union of Pure and Applied Chemistry (IUPAC) based on the average atmospheric pressure at sea level and 15 degrees Celsius. The pascal is the SI unit of pressure defined as one newton per square meter. Standard atmospheric pressure is used as a reference in chemistry, aviation, and meteorology.
What is a pascal and what is it used for?
A pascal (Pa) is the SI unit of pressure equal to one newton of force per square meter of area. Named after French mathematician Blaise Pascal, it is used in engineering, physics, meteorology, and material science. Because one pascal is a very small pressure (about 0.000145 psi), kilopascals (kPa) and megapascals (MPa) are more commonly used in practice. Tire pressure, blood pressure, and weather reports often use related units like bar, mmHg, or millibar.
How do I convert between PSI and atmospheres?
One atmosphere equals approximately 14.696 PSI (pounds per square inch). To convert PSI to atmospheres, divide by 14.696. To convert atmospheres to PSI, multiply by 14.696. For example, a tire inflated to 35 PSI has a pressure of about 2.38 atmospheres (35 / 14.696). PSI is the standard pressure unit in the United States for tires, compressed gas, and hydraulic systems, while atmospheres are more common in scientific contexts.
What is the difference between gauge pressure and absolute pressure?
Absolute pressure measures pressure relative to a perfect vacuum (zero pressure), while gauge pressure measures pressure relative to atmospheric pressure. A tire gauge reading of 35 PSI (gauge) actually means 49.7 PSI absolute (35 + 14.7 atmospheric). In scientific calculations, absolute pressure is usually required. Weather barometers measure absolute atmospheric pressure. This converter works with absolute pressure values by default.
References
Reviewed for accuracy by Manoj Kumar, Mathematics Educator ยท Editorial policy
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