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    Earth Science worksheet
    Topic: Relative Humidity

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    Relative Humidity
    1

    What is the relative humidity when the drybulb temperature is 16°C and the wet-bulb temperature is 10°C?

    (1) 6%

    (2) 14%

    (3) 33%

    (4) 45%

    2

    If air has a dry-bulb temperature of 2°C and a wet-bulb temperature of –2°C, what is the relative humidity?

    (1) 11%

    (2) 20%

    (3) 36%

    (4) 67%

    3

    The diagram below shows a weather instrument used to determine relative humidity.

    reference-tables, relative-humidity, meteorology, measuring-weather-variables, meteorology, dewpoint-humidty-cloud-formation, standard-1-math-and-science-inquery, velocity-slope-sediment-size-channel-shape-stream-valume-distance-from-the-sun-gravitational-force-period-of-revolution-speed-of-revolution, standard-1-math-and-science-inquery, changing-length-of-a-shadow-based-on-the-motion-of-the-sun, standard-6-interconnectedness, models fig: esci12020-examw_g8.png

    What is the relative humidity?

    (1) 40%

    (2) 36%

    (3) 8%

    (4) 4%

    Base your answers to questions 4 on the photographs below and on your knowledge of Earth science. One photograph shows a digital device that recorded several weather variables. The second photograph shows two weather instruments, labeled A and B.

    reference-tables, pressure, meteorology, weather-variables, standard-1-math-and-science-inquery, velocity-slope-sediment-size-channel-shape-stream-valume-distance-from-the-sun-gravitational-force-period-of-revolution-speed-of-revolution, standard-1-math-and-science-inquery, changing-length-of-a-shadow-based-on-the-motion-of-the-sun fig: esci82019-examw_g13.png

    4

    Based on the outside air temperature and relative humidity shown on the digital device, what is the approximate dewpoint for the time shown on the device?

    (1) 8°C

    (2) 12°C

    (3) 18°C

    (4) 31°C

    5

    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?

    (1) Relative humidity is 29% with clear skies.

    (2) Relative humidity is 29% with a good chance of snow.

    (3) Relative humidity is 93% with clear skies.

    (4) Relative humidity is 93% with a good chance of rain.

    6

    What is the relative humidity if the dry-bulb temperature is 26°C and the wet-bulb temperature is 18°C?

    (1) 13 %

    (2) 33 %

    (3) 45 %

    (4) 51 %

    7

    What is the relative humidity if the dry-bulb temperature is 16°C and the wet-bulb temperature is 10°C?

    (1) 45%

    (2) 33%

    (3) 14%

    (4) 4%

    8

    The diagram below represents a sling psychrometer.

    reference-tables, relative-humidity, meteorology, weather-variables, meteorology, dewpoint-humidty-cloud-formation, standard-1-math-and-science-inquery, changing-length-of-a-shadow-based-on-the-motion-of-the-sun, standard-6-interconnectedness, models fig: esci62022-exam_g14.png

    Based on the wet-bulb temperature and the dry-bulb temperature, what is the approximate relative humidity?

    (1) 6%

    (2) 8%

    (3) 30%

    (4) 60%

    9

    The diagram below represents the wet-bulb and dry-bulb temperatures on a sling psychrometer.

    reference-tables, relative-humidity, meteorology, weather-variables, meteorology, dewpoint-humidty-cloud-formation, standard-1-math-and-science-inquery, changing-length-of-a-shadow-based-on-the-motion-of-the-sun, standard-6-interconnectedness, models fig: esci62013-examw_g10.png

    What was the relative humidity of the air when these temperatures were recorded?

    (1) 5%

    (2) 17%

    (3) 20%

    (4) 63%

    10

    The data table below shows the dry-bulb and wet-bulb temperatures measured with a psychrometer on four different days at the same location.

    reference-tables, relative-humidity, meteorology, weather-variables, meteorology, dewpoint-humidty-cloud-formation, standard-1-math-and-science-inquery, changing-length-of-a-shadow-based-on-the-motion-of-the-sun, standard-6-interconnectedness, models fig: esci82017-examw_g30.png

    According to the data shown in the table, which day had the highest relative humidity?

    (1) 1

    (2) 2

    (3) 3

    (4) 4

    Base your answers to questions 11 on the weather map below and on your knowledge of Earth science. On the weather map, the location of the center of a high-pressure system (H) and a front are shown. Isobar values are labeled in millibars (mb). Weather station models represent the weather conditions at Atlanta, Georgia, and Tampa, Florida.

    reference-tables, key-to-weather-map-symbols, meteorology, presentation-of-weather-data, standard-1-math-and-science-inquery, changing-length-of-a-shadow-based-on-the-motion-of-the-sun, standard-6-interconnectedness, models fig: esci12018-examw_g53.png

    11

    Describe one piece of evidence shown on the map that indicates that Tampa, Florida, has a high probability of precipitation. [1]

    Allow 1 credit. Acceptable responses include, but are not limited to:

    • — The dewpoint and air temperature are close together./high relative humidity

    • — 100% cloud cover/overcast

    • — Tampa is close to a front.

    • — The air pressure is low.

    Base your answers to questions 12 on the diagram below, which shows the windward and leeward sides of a mountain range. Arrows show the movement of air over a mountain. Points A and B represent locations at sea level on Earth’s surface.

    meteorology, measuring-weather-variables, meteorology, dewpoint-humidty-cloud-formation fig: esci12013-exam_g44.png

    12

    What is the relative humidity at the base (bottom) of the cloud on the windward side of the mountain? [1]

    %

    Allow 1 credit for 100%.

    Base your answers to questions 13 on the diagram below and on your knowledge of Earth science. The diagram represents a weather balloon as it rises from Earth’s surface to 1000 meters (m). The air temperature and wet-bulb temperature values in degrees Celsius (°C) and the air pressure values in millibars (mb) are given for three altitudes.

    meteorology, measuring-weather-variables, standard-6-interconnectedness, models fig: esci82016-examw_g38.png

    13

    Determine the dewpoint and the relative humidity of the air at Earth’s surface. [1]

    Dewpoint: ______________°C Relative humidity: ________%

    Allow 1 credit if both dewpoint and relative humidity are correct.

    • Dewpoint: 8°C

    • Relative humidity: 40%