Air Pressure at Sea Level Calculator
| Unit | Value |
|---|
Based on the search results, I’ll create a comprehensive table with all the essential information about air pressure at sea level. Here’s what you need to know:
| Aspect | Value |
|---|---|
| Standard sea level pressure | 1013.25 hPa (hectopascals) |
| Equivalent units | 1013.25 millibars (mbar) |
| 101,325 Pa (pascals) | |
| 1 atm (atmosphere) | |
| 760 mmHg (millimeters of mercury) | |
| 29.92 inHg (inches of mercury) | |
| 14.7 psi (pounds per square inch) | |
| Typical range in meteorology | 100 to 1050 millibars |
| Highest recorded (Siberian High) | Close to 1085 hPa |
| Lowest recorded (tropical cyclones) | 870 hPa |
| Average surface pressure on Earth | 985 hPa |
Key Points:
- Sea level pressure is used as the reference for weather reports and aviation.
- Pressure decreases with altitude due to less air mass above.
- Pressure varies with temperature and weather conditions.
- In weather maps, pressure is typically reported in millibars or hectopascals.
- Aviation uses QNH (pressure adjusted to sea level) for altimeter settings.
- The US and Canada use inches of mercury in aviation reports (METAR).
- Pressure is directly proportional to the mass of air above a location.
- Diurnal variations in pressure occur due to atmospheric tides.
- Low pressure often indicates stormy or inclement weather.
- High pressure typically indicates fair weather.
Factors Affecting Pressure:
- Temperature: Warm air is less dense, leading to lower pressure.
- Moisture: Moist air is less dense than dry air.
- Altitude: Pressure decreases with increasing altitude.
- Weather systems: Low and high pressure systems affect local air pressure.
This table and additional information provide a comprehensive overview of air pressure at sea level, including standard values, units of measurement, and key factors influencing atmospheric pressure.