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science weather study tool
Terms in this set (14)
The condition of earth's atmosphere at a particular time and place.
temperature is the measure of the average kinetic energy, a thermometer is an instrument that measures and displays temperature. there are two types of temperature liquid temperature and electrical temperature.
the amount of water vapor in the air, relative humidity is the amount of water vapor in the air compared to the amount of water vapor needed to reach saturation, when air is saturated the rates of evaporation and condensation are equal, saturated air has a relative humidity of 100%, a psychrometer measures relative humidity
the dew point is the temperature at which more condensation than evaporation occurs, when air pressure drops below the dew point condensation forms, this will cause dew on surfaces
5 main types of precipitation
rain, snow, sleet, hail, freezing rain
air pressure is the force of air molecules pushing on an area, the air pressure of an area depends on the weight of the air above that area, air pressure is measured using a barometer, air pressure and density are related both decrease with altitude, molecules at sea level are closer together (denser), this means air pressure is greater at sea level than at higher altitudes
visibility is the measure of transparency of the atmosphere, it is the way we describe how far we can see, it is measured by using 3-4 known landmarks at different distances, poor visibility can be the result of things such as fog or air pollution
anemometer: measures wind speed, psychrometer: measures relative humidity in the air, wind vane: indicates wind direction, thermometer: measures temperature, barometer: measures amount of air pressure, rain gauge: measures amount of precipitation
the movement of air caused by differences in air pressure, greater the distance faster the wind moves
differences in air pressure caused by the uneven heating of earth
as warm air rises at the equator and moves toward the poles it cools, as it cools some of the air sinks around 30 north and south of the equator
the combination of pressure belts and the coriolis effect cause global winds, there are polar easterlies, prevailing westerlies, trade winds
wind belts that extend from the poles to 60 degrees latitude in both hemispheres, formed from cold sinking air moving from the poles creating cold temperatures
wind belts found between 30 and 60 degrees, flow toward the poles from west to east carrying moist air over the united states
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