Bari pressure of atmosphere
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atmospheric pressure baric definition units measurement
Barometric (Atmospheric) Pressure
Barometric pressure - also called atmospheric pressure - is the force exerted by the weight of the air column above any given point on Earth's surface. The name "barometric" comes from the Greek baros (weight) and the instrument used to measure it, the barometer.
Standard Value at Sea Level
| Unit | Standard Value |
|---|---|
| Atmosphere (atm) | 1 atm |
| Pascal (Pa) | 101,325 Pa |
| Hectopascal / Millibar (hPa / mbar) | 1,013.25 hPa |
| Millimeters of Mercury (mmHg / Torr) | 760 mmHg |
| Inches of Mercury (inHg) | 29.92 inHg |
| Pounds per square inch (psi) | 14.696 psi |
How It Works
- Atmospheric pressure is created by gravity pulling the mass of the entire air column down onto a surface.
- It decreases with altitude - there is less overlying air at higher elevations. At 18,000 ft (~5,500 m), pressure is roughly half of sea-level pressure.
- It varies with weather - high pressure (anticyclones) brings fair skies; low pressure (cyclones) brings clouds and rain.
Measuring Barometric Pressure
- Mercury barometer: A glass tube filled with mercury inverted in a mercury dish. Atmospheric pressure pushes mercury up the tube; standard height = 760 mm.
- Aneroid barometer: A sealed, flexible metal cell that expands and contracts with pressure changes - used in most modern instruments.
- Digital sensors: Used in smartphones, weather stations, and aircraft altimeters.
Practical Relevance
- Weather forecasting: A rising barometer indicates improving weather; a falling barometer indicates approaching storms.
- Aviation: Altimeters use air pressure to determine flight altitude.
- Diving: Every 10.3 m (33.8 ft) of water depth adds 1 atm of pressure, so at 10 m underwater a diver experiences ~2 atm total.
- Physiology: Low atmospheric pressure at high altitude reduces the partial pressure of oxygen, causing altitude sickness.
The Wikipedia article on atmospheric pressure and this barometric pressure explainer both give thorough overviews of measurement units and applications.
At imphal
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Imphal atmospheric pressure current hPa altitude elevation
Atmospheric Pressure at Imphal
Imphal (capital of Manipur, Northeast India) sits at an elevation of approximately 786 m (2,579 ft) above sea level in the Imphal Valley.
Calculated Pressure at 786 m
Using the barometric formula (pressure drops ~1.2 hPa per 100 m at low altitudes):
| Property | Value |
|---|---|
| Elevation | ~786 m (2,579 ft) |
| Approximate pressure | ~922 hPa (~922 mbar) |
| In mmHg | ~692 mmHg |
| In atm | ~0.91 atm |
| In kPa | ~92.2 kPa |
From the standard pressure table, at 762 m (~2,500 ft) pressure is 92.5 kPa, which closely matches Imphal's altitude.
Key Points
- Imphal's pressure is about 9% lower than standard sea-level pressure (1013.25 hPa).
- The reduced pressure means slightly lower oxygen partial pressure compared to sea level - relevant for athletes and people with respiratory conditions.
- Daily pressure at Imphal also fluctuates by a few hPa depending on weather systems (monsoon lows in summer, winter highs).
- Imphal experiences the Indian monsoon, which brings distinct seasonal pressure patterns - lower pressure during June-September monsoon, higher in winter.
Note: For real-time barometric pressure at Imphal, weather services like Windy.com or the India Meteorological Department (IMD) provide live readings.
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