| A | B |
|---|
| barometer | device used to measure air pressure |
| high pressure area | areas where pressure is higher than surrounding air |
| low pressure area | areas where pressure is lower than surrounding air |
| cool air block | has greater pressure than warm air block |
| wind vane | device used to find wind direction |
| windsock | cloth bag narrow at one end and open at both ends air enters wide end and narrow end points away |
| humidity | the amount of water vapor in the air |
| relative humidity | amount of water vapor air is holding at a given temp. compared to what it could hold at that temp. |
| condenses | water vapor changes from gas to a liquid |
| evaporate | water chaNges from liquid to a gas |
| cloud | billions of tiny drops of water condensed from the air |
| precipitation | any form of water which falls from the air to the earth's surface |
| rain gauge | device used to measure amount of precipitationi |
