1. What is Standard Atmospheric Pressure?

Standard atmospheric pressure is the typical pressure at sea level (101325 Pa or 1 atm). This calculator estimates how pressure changes with altitude according to the International Standard Atmosphere model.

2. How Does the Calculator Work?

The calculator uses the standard atmospheric pressure equation:

Where:

• \( P \) — Atmospheric pressure (Pascals)
• \( h \) — Altitude above sea level (meters)
• 101325 — Standard pressure at sea level (Pa)
• 2.255 × 10⁻⁵ — Temperature lapse rate constant
• 5.255 — Exponent derived from physical constants

Explanation: The equation models how atmospheric pressure decreases approximately exponentially with increasing altitude.

3. Importance of Atmospheric Pressure Calculation

Details: Understanding pressure changes with altitude is crucial for aviation, meteorology, engineering, and physiology (especially for high-altitude activities).

4. Using the Calculator

Tips: Enter altitude in meters above sea level. The calculator works for altitudes up to the tropopause (~11,000 m).

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this calculation?
A: It provides standard atmosphere values. Actual pressure may vary due to weather conditions and local topography.

Q2: What's the pressure at sea level?
A: Standard sea level pressure is 101325 Pa (1013.25 hPa or 1 atmosphere).

Q3: How does pressure change with altitude?
A: Pressure decreases by about 12% per 1000 meters at low altitudes.

Q4: What's the pressure at Mount Everest's summit?
A: Approximately 33700 Pa (about 1/3 of sea level pressure).

Q5: Can this be used for aircraft cabin pressure calculations?
A: It gives baseline values, but actual cabin pressure systems have additional engineering considerations.