| A | B |
|---|
| weather | state of the atmosphere at a given time and place |
| air pressure | force of air against a unit of area |
| barometer | instrument that measures air pressure |
| anemometer | instrument used to measure wind speed |
| humidity | amount of water vapor in the air |
| psychrometer | instrument used to measure humidity |
| wind vane | instrument used to find wind direction |
| air mass | large section of the atmosphere with the same temperature and humidity throughout |
| cold front | boundary ahead of a cold air mass that is pushing out and wedging under a warm air mass |
| front | boundary line between two air masses |
| warm front | boundary ahead of a warm air ass that is pushing out and riding over a cold air mass |
| isobar | line on a weather map connecting areas of equal air pressure |
| tornado | powerful wind storm with a whirling funnel shaped cloud and extremely low pressure |
| hurricane | a severe tropical storm with high winds that revolve around an eye |
| climate | average weather of a region over a long period of time |
