Definition

Noun: - The pressure exerted by the atmosphere: The continuous physical force exerted by the weight of the air above a given point on the Earth's surface or within the atmosphere. It is a fundamental concept in meteorology and physics.

Usage

• General Use: Used to describe the atmospheric force per unit area at a specific location. Changes in air pressure are associated with weather patterns.
• Scientific Context: A key variable in equations of state (like the ideal gas law) and in calculating altitude.

Examples

• Noun:
  • The air pressure drops significantly as you ascend a mountain.
  • Meteorologists measure air pressure with a barometer to predict weather changes.
  • Low air pressure is often associated with stormy conditions.

Advanced Usage

• "Standard air pressure": Also called standard atmospheric pressure, defined as 101,325 pascals (or 1 atmosphere) at sea level.
  • The experiment was conducted at standard air pressure and temperature.
• "Differential air pressure": A difference in pressure between two areas.
  • Differential air pressure drives the flow of air through ventilation systems.

Variants and Related Words

• Atmospheric pressure (n): A direct synonym for air pressure.
• Barometric pressure (n): Specifically refers to air pressure as measured by a barometer.
• Pressure (n): The more general physical quantity of force per unit area, of which air pressure is a type.

Synonyms

• Atmospheric pressure
• Barometric pressure

Related Phrases

• High-pressure system: A region where the atmospheric pressure at the surface is greater than its surrounding environment, typically associated with calm, clear weather.
  • A high-pressure system is moving in, so we can expect sunny skies.
• Low-pressure system: A region where the atmospheric pressure is lower than that of surrounding areas, often associated with clouds and precipitation.
  • The forecast predicts rain due to an approaching low-pressure system.

Noun

1. the pressure exerted by the atmosphere