## Atmospheric Pressure vs Elevation Calculator

Unit | Value |
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Based on the search results, I'll create a comprehensive table summarizing the key information about atmospheric pressure vs elevation:

Elevation | Atmospheric Pressure | Temperature | Notes |
---|---|---|---|

-1000 m (-3281 ft) | 113.9 kPa (16.52 psi) | 21.5°C (70.7°F) | Below sea level |

0 m (0 ft) | 101.325 kPa (14.7 psi) | 15°C (59°F) | Sea level (standard atmosphere) |

1000 m (3281 ft) | 89.88 kPa (13.04 psi) | 8.5°C (47.3°F) | |

2000 m (6562 ft) | 79.50 kPa (11.53 psi) | 2°C (35.6°F) | |

3000 m (9843 ft) | 70.12 kPa (10.17 psi) | -4.5°C (23.9°F) | |

5000 m (16404 ft) | 54.05 kPa (7.84 psi) | -17.5°C (0.5°F) | |

10000 m (32808 ft) | 26.50 kPa (3.84 psi) | -50°C (-58°F) | Typical cruising altitude for commercial aircraft |

20000 m (65617 ft) | 5.53 kPa (0.80 psi) | -56.5°C (-69.7°F) | Stratosphere |

Key Points:

- Pressure decreases with increasing altitude.
- At low altitudes, pressure decreases by about 1.2 kPa (0.17 psi) for every 100 meters (328 feet) of elevation gain.
- Temperature generally decreases with altitude in the troposphere (up to about 11 km or 36,000 ft).
- The relationship between pressure and altitude is not linear and is affected by temperature and humidity.
- Standard sea-level pressure is defined as 101.325 kPa (14.7 psi) at 15°C (59°F).
- Atmospheric pressure is often measured in hectopascals (hPa) or millibars (mbar), where 1 hPa = 1 mbar = 0.1 kPa.
- Barometric formula for pressure at altitude h: p = p0 * (1 - 2.25577 * 10^-5 * h)^5.25588, where p0 is sea-level pressure.
- Pressure changes affect various phenomena, including boiling points of liquids and the performance of engines and aircraft.

This table and information provide a comprehensive overview of the relationship between atmospheric pressure and elevation, including key values and principles for understanding this important atmospheric property.