air pressure
Học thuậtThân thiện
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
- the pressure exerted by the atmosphere