Relative Humidity and Dew Point

The phase change from water vapor to liquid water is known as:

• evaporation
• precipitation
• condensation
• sublimation

Dew is most likely to form 

• after heavy rain on a humid day
• when humid air contacts cold ground
• when the snow on the ground melts
• during windy nights when it rains

Where can you find water vapor in the air? 

• only in clouds             
• only as rain                     
•  everywhere

The actual amount of water vapor in the air is called

• air pressure
• humidity
• relative humidity
• dew point

If the air is only holding one-third as much moisture as it can possibly hold, what is the relative humidity?

• 50%
• 25%
• 33%
• 67%

Which type of air has a relative humidity of 100%?

• space
• hot
• dry
• saturated

The temperature at which air is saturated with water vapor and condensation occurs is called

• humidity
• air pressure
• dew point
• relative humidity

Molecular motion _________ when temperature is increased.

• Increases
• Decreases

If the air is only holding one-fourth as much moisture as it can possibly hold, what is the relative humidity?

• 50%
• 25%
• 33%
• 67%

Which weather instrument is useful in measuring relative humidity?

• barometer
• anemometer
• psychrometer
• wind vane