| A | B |
|---|
| weather | the short term condition of the atmosphere at any location |
| temperature | specific degree of hotness or coldness as indicated on or referred to a standard scale |
| dew point | temperature at which water vapor present in the air saturates air and begins to condense; dew forms |
| relative humidity | ratio of the mass of water vapor per unit volume of the air to the mass of water vapor per unit volume of saturated air at the same temperature |
| psychrometer | instrument consisting of a dry bulb and a wet bulb thermometer used to determine the dew point temperature and the relative humidity |
| dry bulb thermometer | a thermometer having a dry bulb: used in conjunction with a wet-bulb thermometer in a psychrometer |
| wet bulb thermometer | a thermometer having a bulb that is kept moistened when humidity determinations are being made with a psychrometer |
| air pressure | force exerted due to the weight of air |
| barometer | instrument used to measure air pressure |
| millibars | units used to measure air pressure |
| isobars | A line on a weather map connecting points of equal atmospheric pressure |
| wind | movement of air caused by Earth systems |
| wind vane | weather instrument used to determine the direction of the wind |
| anemometer | instrument with rotating cups used to determine wind speed |
| condensation | change in state from vapor (gas) to liquid, the loss of water vapor from warmer air into a cooler surface, such as the condensation (fog) on an ice water glass |
