1 / 5

Air Pressure

Air Pressure. Air has mass and volume, therefore it exerts pressure. Air Pressure-what is it?. Air pressure is also known as atmospheric pressure or barometric pressure; It is a measure of the weight of air pressing down on a given area of Earth’s surface;

nusa
Télécharger la présentation

Air Pressure

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Air Pressure Air has mass and volume, therefore it exerts pressure

  2. Air Pressure-what is it? • Air pressure is also known as atmospheric pressure or barometric pressure; • It is a measure of the weight of air pressing down on a given area of Earth’s surface; • It is caused by the weight of the air from the top of the atmosphere pressing down on the layers of air below; • The layers press down on each other because gravity pulls the air molecules down.

  3. Barometer=Instrument to measure air pressure • Air has mass and volume; as a result, it exerts pressure; • Air is also considered to be a fluid as it has the ability to take the shape of its container and to flow; • Meteorologists use an instrument called a BAROMETER to measure changes in air pressure; • The data is reported in units of inches.

  4. High and low pressure systems • High pressure systems= regions of sinking cool air or anticyclones; (high pressure=cold air=air is heavy and sinks) • Low pressure systems= regions of rising warm moist air or cyclones or depressions (low pressure=warm air=air is light and it rises). • -areas of high pressure (thumb up) is usually associated with fair, nice weather; • -areas of low pressure (thumb down) is usually associated with rainy and stormy weather.

  5. Isobars • -meteorologists identify air masses as high and low pressure by collecting barometric pressure data from weather reporting stations; • -barometric pressure data is plotted on a map and lines are drawn to connect areas of equal pressure (= known as isobars); • -barometric pressure decreases as one moves to the center of the low pressure area; barometric pressure increases as one moves to the center of a high-pressure area.

More Related