Humidity Dewpoint and How Clouds Form

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

• evaporation
• precipitation
• condensation
• sublimation

Dew Point is the

• temperature air cools down to reach condensation (or turn into a liquid)
• temperature where ice melts to liquid water
• temperature where ice turns directly into water vapor
• time of day when dew on the ground disappears

If the air is "saturated", that means:

• the air is full of water
• the air is partially full of water
• it's amount of water vapor in the atmosphere right now
• how much liquid water it potentially can hold

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

Water vapor is one of the components of the air in the atmosphere.  What change causes the vapor in the air to form clouds?

• A.  As air rises in the atmosphere, it becomes warmer and cannot hold as much water. 
• B. As air cools, water vapor in the air condenses to liquid or solid state. 
• C. Air rises, the water becomes heavier and changes form.

Where can you find water vapor in the air? 

• only in clouds             
• only as rain                     
•  everywhere

Water molecules suspended in air can be described as _?_.

• liquid
• gas
• solid

The name for the process in which water vapor changes back into a liquid is

• Evaporation
• Condensation
• Sublimation
• Deposition

As the air temperature increases, the air's capacity for water vapor: 

• increases
• decreases
• remains the same
• is unrelated to air temperature and can either increase or decrease

The time of day when the relative humidity reaches a maximum value is usually

• at the time when the air temperature is highest 
• in the middle of the afternoon 
• at the time when the air temperature is lowest 
• just before sunrise