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A sling psychrometer is used to determine which weather variables?
wind speed and wind direction
dew point and relative humidity
cloud cover and cloud altitude
air temperature and air pressure
What is the dewpoint when the dry bulb temperature is 20°C and the relative humidity is 17%?
The dew point is 15°C. What is the wet-bulb temperature on a sling psychrometer if the dry-bulb temperature is 18°C?
A student using a sling psychrometer measured a wet-bulb temperature of 10°C and a dry-bulb temperature of 16°C. What was the dew point?
What is the dew point when the dry-bulb temperature is 12°C and the wet-bulb temperature is 7°C?
If air has a dry-bulb temperature of 2°C and a wet-bulb temperature of –2°C, what is the relative humidity?
A dry-bulb temperature of 30°C and a wet-bulb temperature of 29°C were recorded at a weather station. What are the relative humidity and the most likely weather conditions?
Relative humidity is 29% with clear skies.
Relative humidity is 29% with a good chance of snow.
Relative humidity is 93% with clear skies.
Relative humidity is 93% with a good chance of rain.
The diagram represents the wet-bulb and dry-bulb temperatures on a sling psychrometer. What was the relative humidity of the air when these temperatures were recorded?
The diagram shows dry-bulb and wet-bulb temperature readings for a parcel of air. What is the dew point of the air?
The weather instrument is used to determine dew point and relative humidity. Based on the temperature shown, the approximate dew point and relative humidity are
–19°C and 4%
–5°C and 25%
8°C and 4O%
12°C and 53%
What is the relative humidity if the dry-bulb temperature is 22°C and the wet-bulb temperature is 17°C?
Which graph best shows the general relationship between altitude and temperature in the troposphere?
Which list correctly matches each instrument with the weather variable it measures?
wind vane—wind speed
precipitation gauge—relative humidity
wind vane—wind direction
rain gauge—amount of precipitation
Which weather instrument is used to measure wind speed?
Which weather instrument was used to measure the air pressure?
The relative humidity is 100% when
the atmosphere is relatively dry
the air is at its saturated vapor pressure
the air pressure is high
transpiration equals evaporation
Adjacent water and land surfaces have the same temperature at sunrise on a clear, calm day. A surface wind develops after the water and land are heated by the Sun for a few hours. On which map do the arrows best represent the direction of this wind?
In which cross section do the arrows represent the most probable direction of air movement over land and water surfaces at an ocean coast on a hot, sunny, summer afternoon?
In the diagram, arrows represent air movement near an ocean coastline on a summer afternoon. Compared to the air over the ocean, the air over the land has a
lower temperature and lower barometric pressure
lower temperature and higher barometric pressure
higher temperature and lower barometric pressure
higher temperature and higher barometric pressure
During the warmest part of a June day, breezes blow from the ocean toward the shore at the beach. Which statement best explains why this happens?
Winds usually blow from hot to cold areas.
Air pressure over the ocean is higher than air pressure over the land.
Winds never blow from the shore toward the ocean.
Air pressure over the land is higher than air pressure over the ocean.
Air pressure is usually highest when the air is
cool and humid
cool and dry
warm and humid
warm and dry
The cross section shows a sea breeze blowing from the ocean toward the land. The air pressure at the land surface is 1013 millibars. The air pressure at the ocean surface a few miles from the shore is most likely
Earth's surface winds generally blow from regions of higher
air pressure toward regions of lower air pressure
air temperature toward regions of lower air temperature
latitudes toward regions of lower latitudes
elevations toward regions of lower elevations
Surface winds on Earth are primarily caused by differences in
ocean wave heights during the tidal cycle
rotational speeds of Earth’s surface at various latitudes
distances from the Sun during the year
air density due to unequal heating of Earth’s surface
The arrows on which map best show the pattern of surface winds around these two pressure centers?