Moisture in the Atmosphere

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Water in the Atmosphere

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Presentation transcript:

Moisture in the Atmosphere Chapter 18

Humidity 18.1 Brain Pop: Humidity

Humidity: the amount of water vapor in the air

The warmer the air, the more H2O vapor it can hold! Saturated: The state of air that contains the maximum quantity of water vapor that it can hold at any given temperature and pressure. The warmer the air, the more H2O vapor it can hold!

Expressed as a percentage! Relative humidity: the ratio of the air’s actual water-vapor content compared with the amount of water vapor air can hold at that temperature and pressure Expressed as a percentage! Relative humidity=specific humidity X 100 capacity (saturated)

Dew Point: The temperature that air must be lowered to in order for water vapor to condense

moist air dry air High dew point temperature = Any time the air temperature drops below the dew point, dew, clouds, or fog will form moist air Low dew point temperature = dry air If dew point is below freezing, frost will form For every 10oC increase in temperature, the amount of water vapor needed for saturation doubles

Psychrometer: instrument used to measure relative humidity Measuring Humidity Psychrometer: instrument used to measure relative humidity Works on principle that evaporation causes cooling 2 thermometers…wet-bulb and dry-bulb Readings show how dry the air is How to measure relative humidity

Can YOU measure Relative Humidity?! Let’s practice!