| A | B |
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| anemometer | an instrument used to determine wind speed |
| wind vane | is a movable device attached to an elevated object such as a roof for showing the direction of the wind |
| wind | is the flow of air or other gases that compose an atmosphere |
| trough | an elongated region of low atmospheric pressure |
| ridge | a region of high atmospheric pressure |
| prevailing wind | a wind that consistently blows from one direction |
| millibar | unit of pressure |
| low | areas that have less atmospheric mass above their location |
| isobar | a contour line of equal or constant pressure |
| high | areas have more atmospheric mass above their location |
| gradient wind | the curved airflow pattern around a pressure center resulting from a balance among pressure gradient forces |
| divergence | the condition that exists when the wind distribution within a given region results in a net horizontal outflow of air into the area |
| cyclone | is an area of low atmospheric pressure characterized by inward spiraling winds that rotate counter clockwise in the northern hemisphere |
| convergence | the condition that exists when the wind distribution within a given region results in a net horizontal inflow of air into the area |
| anticyclone | is a weather phenomenon in which there is a descending movement of the air and a high pressure area over the part of the planet's surface affected by it |
| barometer | is an instrument used to measure atmospheric pressure |
| air pressure | the force exerted by the weight of a column of air above a given point |
| aerovane | a device like a wind mill to detect wind speed and direction |
