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atmospheric pressure

vr.tr.atmospheric-pressure · thing-q81809

Let an agent explain atmospheric pressure and its measurement, relay physics, variation and weather significance from meteorological references, describe aviation settings and oscillation patterns, and distinguish atmospheric pressure from other pressures and from altitude.

Thing Registry Cross-cutting context XCT.STA
Bundle → Layer → Finding → QuestionsClassifiersWhat it isWhy it existsDistinguishing featuresWhat robots and AI may and may not doMoral aspectsOwnersLinks to other meta-modelsIdentity and identifiersDirect propertiesRecognitionCapabilities and actionsHazards and failure modesStandards and interfacesContext of useSources

Bundle → Layer → Finding → Questions Filled

4 bundles · 8 layers · 8 findings · 16 questions

Understand What atmospheric pressure is.

Definition

Definition.

Definition

Definition.

  1. What is atmospheric pressure, and how does it differ from gauge pressure and altitude? definition
  2. Is the question about physics, weather, aviation or climate? boundary

Variation

Variation.

Variation

Variation.

  1. How does pressure vary with altitude, temperature and weather systems? definition
  2. Which entry fits the barometric formula? action
Measure Measurement.

Instruments

Barometers.

Instruments

Instruments.

  1. How do mercury, aneroid and digital barometers measure pressure? provenance
  2. Which references are standard? provenance

Aviation

Aviation settings.

Aviation

Aviation.

  1. What are QFE, QNH and standard pressure settings, and how are they used in altimetry? provenance
  2. Which sources are cited? provenance
Weather Weather and climate.

Systems

Pressure systems.

Systems

Systems.

  1. How do high and low pressure systems shape weather? provenance
  2. Which entry fits weather forecasting? action

Oscillation

Southern Oscillation.

Oscillation

Oscillation.

  1. What is the Southern Oscillation, and how is it linked to El Nino and La Nina? provenance
  2. Which entry fits El Nino-Southern Oscillation? action
Context Effects and history.

Effects

Effects.

Effects

Effects.

  1. How does pressure affect boiling points, human physiology at altitude and engineering, in general terms? provenance
  2. Which entry fits altitude sickness? action

History

History.

History

History.

  1. How did Torricelli, Pascal and others discover and measure atmospheric pressure? provenance
  2. Which entry fits the history of meteorology? action

Classifiers Filled

Family
Thing Registry
Category
Cross-cutting context
Entry kind
thing
Plane
XCT
Domain
XCT.STA
Other names and narrower kinds
QFE, Southern Oscillation

What it is Filled

The pressure exerted by the weight of the atmosphere at a given point, about 101325 pascals at sea level and decreasing with altitude, measured with barometers and reported in hectopascals, millibars or inches of mercury, used in aviation as QFE for pressure at an aerodrome and QNH for sea-level reduced pressure, and studied in meteorology through patterns such as the Southern Oscillation, the seesaw of pressure across the Pacific linked to El Nino.

Why it exists Filled

Let an agent explain atmospheric pressure and its measurement, relay physics, variation and weather significance from meteorological references, describe aviation settings and oscillation patterns, and distinguish atmospheric pressure from other pressures and from altitude.

Distinguishing features Filled

  • Weight of air column
  • Altitude dependence
  • Weather driver
  • Aviation settings

What robots and AI may and may not do Filled

Must not

  • Give a pilot an altimeter setting that does not come from an authorised aviation source.
  • Mix hectopascals and inches of mercury without stating the unit.
  • Present a sea-level reduced pressure as the pressure at the station.
  • Alter or fabricate pressure records in a weather observation.

Only with a human decision

  • Issuing altimeter settings or pressure data used for flight operations.

May

  • Report atmospheric pressure readings with units, time and station.
  • Explain the difference between station pressure, QFE and QNH.

Moral aspects Filled

  • Wrong altimeter settings have led aircraft into terrain.
  • Pressure trends warn of storms; errors can delay warnings.

Who is affected

  • Pilots and passengers
  • Forecasters
  • People exposed to storms

Owners Filled

Steward

National meteorological services and air navigation providers issue official readings.

Master systems

  • National weather observation archives

Links to other meta-models Filled

parent

  • Q107715 - registry parent class
  • Q58928516 - registry parent class
  • Q789775 - registry parent class

related

  • physical quantity - in registry terms
  • ambient pressure - in registry terms
  • meteorological concept - in registry terms
  • barometer - in hectopascals

What else AI and robots need to interact with it Filled

Identity and identifiers required Filled

  • Vercy registry: vr.tr.atmospheric-pressure
  • Wikidata: Q81809 (https://www.wikidata.org/wiki/Q81809)

Direct properties not applicable Not applicable

  • standard sea-level pressure: 101325 Pa
  • decrease with altitude: about 12 hPa per 100 m - near sea level
  • highest recorded: 1084.8 hPa - Tosontsengel 2001
  • lowest recorded: 870 hPa - Typhoon Tip 1979

Plane XCT: no invented physical properties.

Recognition optional Filled

  • Pressure of the atmosphere
  • Sea-level standard 1013.25 hPa, QFE, QNH, Southern Oscillation
  • Gauge pressure is relative; ambient pressure includes other fluids; altitude is height
  • Not a visible object; read from a barometer.

Capabilities and actions required Filled

  • explain the quantity
  • relay measurement and variation
  • describe weather and aviation use
  • distinguish related concepts

Hazards and failure modes required Filled

  • Altimeter setting errors in aviation
  • Confusing station and sea-level pressure
  • Unit confusion between hPa, mbar and inHg

Standards and interfaces required Filled

  • WMO observation standards
  • ICAO standard atmosphere and altimeter setting procedures
  • SI units

Context of use required Filled

  • Not applicable; a physical quantity.
  • station and sea-level pressure
  • QFE and QNH aviation settings
  • high and low pressure systems
  • pressure oscillations such as the Southern Oscillation
  • partial pressures within the atmosphere

Sources Filled

  1. Wikidata item Q81809: atmospheric pressure - identity and sense of the item
  2. Wikipedia: Atmospheric pressure - general description of the item

Open questions

  • Should QFE, QNH and the Southern Oscillation be separate primary entries?
  • How should meteorological references be linked?
  • The registry entry has merged aliases naming an aviation setting and a climate pattern; should they be split off?

Machine files

Card as JSON Specification Card backlog vercy.card/1

Provenance

thing registry research (pass 2) · unreviewed

Built from: models/things/publications/thing-q81809/spec.json