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📘 Standard Pressure
29.92 inHg (Standard)
1013.25 hPa/mb (Standard)
760 mmHg (Standard)
🧠 High vs Low
High Pressure (>30.20 inHg): Clear skies, calm weather.
Low Pressure (<29.50 inHg): Storms, wind, rain.
Hurricane pressure can drop below 27 inHg!
✍️ Altimeters
Pilots use barometric pressure to determine altitude. If they forget to update the "Altimeter Setting" (e.g. 29.92), they might crash into a mountain because the altimeter will read potentially thousands of feet wrong.
📊 History
Torricelli inverted a tube of mercury into a dish. The weight of the atmosphere pushed the mercury up the tube exactly 29.92 inches (760mm). That is why we measure pressure in "length" of metal!
✅ Key Takeaways
- US uses inHg.
- Science uses hPa.
- Medicine uses mmHg (Blood pressure).
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