Barometric Pressure to Millibars Converter
| Unit | Value |
|---|
Information:
Standard atmospheric pressure at sea level: 1013.25 hPa (millibars)
This is equivalent to 29.92 inHg, 760 mmHg, 1 atm, or 14.7 psi
Here’s a comprehensive table with all the essential information about converting barometric pressure to millibars:
| Unit | Equivalent in Millibars | Conversion Factor |
|---|---|---|
| 1 Millibar (mbar) | 1 mbar | 1 |
| 1 Hectopascal (hPa) | 1 mbar | 1 |
| 1 Inch of Mercury (inHg) | 33.8639 mbar | 33.8639 |
| 1 Millimeter of Mercury (mmHg) | 1.33322 mbar | 1.33322 |
| 1 Atmosphere (atm) | 1013.25 mbar | 1013.25 |
| 1 Pound per Square Inch (psi) | 68.9476 mbar | 68.9476 |
| 1 Kilopascal (kPa) | 10 mbar | 10 |
Key Points:
- Standard atmospheric pressure at sea level: 1013.25 mbar (1 atm)
- Typical range of atmospheric pressure: 950 mbar to 1050 mbar
- 1 millibar = 1 hectopascal (hPa)
- Weather maps often use millibars or hectopascals
Common Pressure Values:
| Condition | Pressure in Millibars |
|---|---|
| Very low (hurricane) | < 950 mbar |
| Low pressure system | 980 – 1000 mbar |
| Average sea level pressure | 1013.25 mbar |
| High pressure system | 1020 – 1040 mbar |
| Very high pressure | > 1040 mbar |
Conversion Formulas:
- inHg to mbar: mbar = inHg × 33.8639
- mmHg to mbar: mbar = mmHg × 1.33322
- atm to mbar: mbar = atm × 1013.25
- psi to mbar: mbar = psi × 68.9476
- kPa to mbar: mbar = kPa × 10
Important Notes:
- Pressure decreases with altitude at approximately 1 mbar per 8 meters of elevation.
- In meteorology, “rising pressure” typically indicates improving weather, while “falling pressure” often suggests approaching storms or precipitation.
- The barometer reading must be corrected for temperature and altitude for accurate measurements.
- Digital weather stations often display pressure in hPa, which is numerically equivalent to mbar.
Applications:
- Weather forecasting
- Aviation (altimeter settings)
- Scuba diving (to measure water pressure)
- Industrial processes
- Meteorological research
Historical Context:
- The millibar was introduced in the early 20th century to simplify meteorological calculations.
- Before widespread use of millibars, inches of mercury was common in English-speaking countries.
This table and additional information provide a comprehensive overview of barometric pressure conversions to millibars, including key conversion factors, common values, and important considerations. This knowledge is crucial for meteorologists, pilots, engineers, and anyone working with atmospheric pressure measurements in various fields.