Dew Point, Relative Humidity, Winds, and Air Pressure

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%?

• – 5°C

• – 2°C

• 11°C

• 15°C

The dew point is 15°C. What is the wet-bulb temperature on a sling psychrometer if the dry-bulb temperature is 18°C?

• 2°C

• 3°C

• 20°C

• 16°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?

• –10°C

• 45°C

• 6°C

• 4°C

What is the dew point when the dry-bulb temperature is 12°C and the wet-bulb temperature is 7°C?

• 1°C

• –5°C

• 28°C

• 48°C

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

• 11%

• 20%

• 36%

• 67%

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?

• 5%

• 17%

• 20%

• 63%

The diagram shows dry-bulb and wet-bulb temperature readings for a parcel of air. What is the dew point of the air?

• 27°C

• 3°C

• 10°C

• –5°C

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%