Convert MPa to Standard Atmospheres (atm)
1 MPa equals 9.86923 standard atmospheres.
MPa to Standard Atmosphere Converter
How to Convert MPa to Standard Atmosphere
1 MPa = 9.86923 standard atmospheres
Standard Atmosphere = MPa × 9.86923
Example: 1 MPa × 9.86923 = 9.86923 atm
Reverse Conversion
To convert standard atmospheres back to MPa:
- Remember, 1 standard atmosphere equals 0.101325 MPa.
- To convert 9.86923 atm to MPa, multiply
9.86923 x 0.101325, resulting in1 MPa.
Common MPa to Standard Atmosphere Conversions
MPa to standard atmospheres Conversion Table
Reference table with common mpa to standard atmospheres conversions. All values calculated with high precision.
MPa to Standard Atmospheres Table
0.0001 to 12
MPa to Standard Atmospheres Table
1 to 100000
Standard Atmospheres to MPa Table
0.001 to 5
Standard Atmospheres to MPa Table
10 to 1000000
Definition of MPa
Megapascal: High-Pressure Applications
The megapascal (MPa) is an SI-derived unit of pressure equal to 1,000,000 pascals (1,000 kPa or 10 bar). It is commonly used in engineering and materials science for measuring high pressures, such as the tensile strength of materials, hydraulic system pressures, and geological pressures. The megapascal provides convenient numbers when dealing with pressures that would be unwieldy in pascals or kilopascals.
Conversions to Other Units of Measurement:
- Bar: 1 megapascal equals exactly 10 bar. This simple relationship makes MPa convenient for high-pressure industrial work. For example, 20 MPa equals 200 bar.
- PSI: 1 megapascal equals approximately 145.038 psi. This conversion is essential for engineering specifications. For example, a steel with 250 MPa yield strength equals approximately 36,260 psi.
- Kilopascal (kPa): 1 megapascal equals exactly 1,000 kPa. For example, 5 MPa equals 5,000 kPa.
- Pascal (Pa): 1 megapascal equals exactly 1,000,000 pascals. This is the fundamental SI relationship.
- Atmosphere (atm): 1 megapascal equals approximately 9.86923 atm. This shows that MPa represents significantly higher pressures than atmospheric.
The megapascal is essential in structural engineering, material science, and any application involving high pressures.
- Definition
- SI-derived pressure unit equal to 1,000,000 pascals (10⁶ Pa).
- Exact factor
- 1 MPa = 1,000,000 Pa (exact); 1 MPa = 10 bar (exact)
- Common equivalents
- 1 MPa = 1,000 kPa (exact)
- 1 MPa ≈ 145.038 psi
- 1 MPa ≈ 9.86923 atm
- Sources
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
About the MPa
Facts & Uses
- 1 MPa = 1,000,000 Pa = 1 N/mm² exactly — the convenient unit for high pressures and material stresses.
- Standard in materials science for tensile strength: structural steel ≈ 250 MPa yield, high-strength steel 400-700 MPa, carbon fiber 3500+ MPa.
- Used in hydraulic systems (typical hydraulic pressures 10-35 MPa), injection molding, and industrial pressure vessels.
- High-pressure applications: diamond anvil cells reach 100-300 GPa; deep ocean trenches around 100 MPa at the Mariana Trench.
Curiosities
- Concrete compressive strength is typically expressed in MPa: 25 MPa for residential, 40+ MPa for high-rise buildings, 100+ MPa for ultra-high-performance concrete.
- The Earth's pressure at the core-mantle boundary reaches about 136 GPa = 136,000 MPa — beyond what can be sustained at the surface in any container.
- 1 MPa is approximately the pressure under a 1 cm column of mercury per square millimeter, or about 145 psi.
- Approximate equivalents: 1 MPa = 145 psi = 9.87 atm = 10 bar.
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
Frequently Asked Questions
How many standard atmospheres are in one MPa?
One MPa equals 9.86923 standard atmospheres. To convert, multiply the MPa value by 9.86923. For the reverse, divide the standard atmosphere value by 9.86923 (or multiply by 0.101325).
What is 10 MPa in standard atmospheres?
10 MPa = 98.692 standard atmospheres. This is one of the most commonly searched conversions for this pair.
How precise is the MPa-to-standard atmosphere conversion?
The factor 9.86923 is accurate to 6 significant figures, derived from international measurement standards. Our calculator uses full precision internally.
Looking for the reverse? Convert Standard Atmosphere to MPa
Related Pressure Converters
Explore other pressure conversion tools:
Related in other categories:
- Liters to Gallons — Standard atmosphere × volume in gas law
