Dew Point and Relative Humidity Calculations

A psychrometer is used to determine which weather variables?

• wind speed and wind direction

• percentage of cloud cover and cloud height

• air pressure and air temperature

• relative humidity and dew point

What is the relative humidity when the dry-bulb temperature is 16°C and the wet-bulb temperature is 14°C?

• 90%

• 80%

• 14%

• 13%

An observer measured the air temperature and the dewpoint and found the difference between them to be 12°C. One hour later, the difference between the air temperature and the dewpoint was found to be 4°C. Which statement best describes the changes that were occurring?

• The relative humidity was decreasing and the chance of precipitation was decreasing

• The relative humidity was decreasing and the chance of precipitation was increasing

• The relative humidity was increasing and the chance of precipitation was decreasing

• The relative humidity was increasing and the chance of precipitation was increasing

Tags

NGSS.MS-ESS2-5

The dewpoint changes most directly as a result of changes in the atmosphere's

• wind pressure

• wind direction

• water vapor content

• convection currents

Tags

NGSS.MS-ESS2-5

As the dewpoint temperature of a sample of air decreases, the amount of moisture in that sample of air

• decreases

• increases

• remains the same

Tags

NGSS.MS-ESS2-5

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

• 16°C

• 2°C

• 3°C

• 20°C

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

• 6%

• 14%

• 33%

• 45%

What is the relative humidity of the air when the dry-bulb temperature is 4°C and the dewpoint is –4°C?

• 51%

• 56%

• 46%

• 23%

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

• 1

• 2

• 3

• 4

Tags

NGSS.MS-ESS2-5

What is the dewpoint when the dry bulb temperature is 20°C and the relative humidity is 17%?

• – 5°C

• -2°C

• 15°C

• 11°C