Humidity and Density

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 vapor
• 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

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

• Evaporation
• Condensation
• Sublimation
• Deposition

The temperature to which air must be cooled in order to become saturated is the: 

• Relative Humidity
• Mixing Ratio
• Dew Point Temperature
• Wet-bulb Temperature

The sun heats up surface water, causing evaporation (turning a liquid into a gas).  The water vapor then rises into the air creating....

• rain
• pollution
• fog
• humidity

Water droplets that condense from the air onto cool surfaces near the ground are called....

• fog
• precipitation
• dew
• icicles

What is relative humidity?

• humidity that is related to other humidity
• condensation
• clouds
• the amount of water in the air compared to the amount of water the air can hold - a ratio