Understanding Humidity, Dew Point, and the Sling Psychrometer

What does relative humidity measure?

• The actual temperature of the air

• The percentage of moisture in the air compared to its maximum capacity

• The speed of wind in the atmosphere

• The amount of rainfall in a specific area

What is the dew point?

• The temperature at which ice melts

• The highest temperature recorded in a day

• The temperature at which air becomes saturated and water vapor condenses

• The average temperature of a region

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What is the primary function of a sling psychrometer?

• To measure wind speed

• To predict rainfall

• To determine the relative humidity and dew point

• To calculate the air pressure

How does the wet-bulb thermometer in a sling psychrometer work?

• It measures the air pressure directly

• It cools down as water evaporates from its wet cloth

• It heats up when exposed to sunlight

• It remains at a constant temperature

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What happens when the air temperature and dew point are close together?

• The air feels very moist

• The air feels very dry

• The air pressure increases

• The wind speed decreases

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Why is relative humidity considered 'relative'?

• Because it is constant throughout the day

• Because it varies with wind speed

• Because it is dependent on the air temperature

• Because it changes with altitude

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What does a 100% relative humidity indicate?

• The air is completely dry

• The air is saturated and cannot hold more moisture

• The air is at its coldest point

• The air is at its hottest point

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What is the 'wet bulb depression'?

• The lowest temperature recorded in a day

• The average temperature of a region

• The temperature at which ice forms

• The difference between the dry bulb and wet bulb temperatures

How does temperature affect the amount of moisture air can hold?

• Moisture capacity is only affected by wind speed

• Colder air can hold more moisture than warmer air

• Warmer air can hold more moisture than colder air

• Temperature has no effect on moisture capacity

What is the role of the dry-bulb thermometer in a sling psychrometer?

• To measure the regular air temperature

• To measure the air pressure

• To measure the wind speed

• To measure the amount of rainfall