Humidity and Pressure

Most clouds form in the atmosphere when moist air

• rises, expands, and warms to the dewpoint

• rises, expands, and cools to the dewpoint

• sinks, compresses, and cools to the dewpoint

• sinks, compresses, and warms to the dewpoint

Tags

NGSS.MS-ESS2-4

NGSS.MS-ESS2-5

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

• 42%

• 46%

• 51%

• 56%

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

Clouds most likely form as a result of

• moist air rising, compressing, and warming

• moist air rising, expanding, and cooling

• dry air rising, compressing, and warming

• dry air rising, expanding, and cooling

Tags

NGSS.MS-ESS2-4

NGSS.MS-ESS2-5

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

• 4%

• 37%

• 45%

• 16%

A psychrometer is used to determine which weather variables?

• air pressure and air temperature

• wind speed and wind direction

• percentage of cloud cover and cloud height

• relative humidity and dewpoint

Which weather variable generally decreases when wind speed is increasing, clouds are thickening, and visibility drops?

• relative humidity

• dewpoint

• air pressure

• precipitation

Tags

NGSS.MS-ESS2-5

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

• 27°C

• 10°C

• 3°C

• -5°C

Tags

NGSS.MS-ESS2-5

The highest surface wind speeds occur when there is a

• 4-millibar air-pressure difference between two nearby locations

• 4-millibar air-pressure difference between two distant locations

• 20-millibar air-pressure difference between two nearby locations

• 20-millibar air-pressure difference between two distant locations

Tags

NGSS.MS-ESS2-5

The incomplete flowchart below shows some of the changes that occur in warm air as it rises to form a cloud. Which statement should be placed in the empty box to accurately complete the flowchart?

• The air warms as it expands.

• The air enters the thermosphere.

• The air cools until it reaches the dewpoint

• The air’s relative humidity decreases to zero.

Tags

NGSS.MS-ESS2-4

NGSS.MS-ESS2-5