| A | B |
|---|
| isobar | a contour line of equal or constant pressure |
| low | areas that have less atmospheric mass above their location |
| millibar | unit of pressure |
| prevailing | a wind that consistently blows from one direction |
| ridge | a region of high atmospheric pressure |
| trough | an elongated region of low atmospheric pressure |
| wind | is the flow of air or other gases that compose an atmosphere |
| aneroid | a type of barometer that consists of empty metal chambers |
| anemometer | an instrument used to determine wind speed |
| air pressure | the force exerted by the weight of an column of air above a given point |
| barometer | is an instrument used to measure atmospheric pressure |
| anticyclone | is the weather phenmenon in which there is a descending movement of the air and a high pressure area |
| cyclone | area of low pressure with inward spirling winds that rotate counter clockwise |
| divergence | the condition where winds divert and leave a net outflow of air |
| convergence | the condition that exists when the wind has a net inflow of air to that area |
