Ch.4 : humidity,Condensation, Clouds

Question 0

Condensation

Answer 0

water vapor changes back to liquid

Question 1

evaporation

Answer 1

sun’s energy transforms enormous quantities of liqiud into water vapor

Question 2

saturation

Answer 2

condensation & evaporation are equal humidity is now 100% = same # of water leavin the liquid as going back in
for every molecule that evaporates , one musy condense

Question 3

subsaturation

Answer 3

if more evaporation is occurring than condensation, then net evaporation is occurring

Question 4

supersaturation

Answer 4

if more condensation than evaporation is occurring

Question 5

cloud condensation nuclei

Answer 5

air molecules are microscopic bits of dust, smoke and salt, many of these surfaces on which water spray condense

Question 6

humidity

Answer 6

refers to any one of a number of specifying the amount of water vapor in air

Question 7

relative humidity

Answer 7

•ratio of the amount of water vapor actually in the air to maximum amount of water vapor required for saturation at a particular temp & pressure
• its ratio of airs water vapor content to its capacity
R.H = water vapor content/ water vapor capacy

Question 8

vapor pressure

Answer 8

the partial pressure of water vapor

Question 9

saturation vapor pressure

Answer 9

how much water vapor is necessary to make the air saturated at any given temperature

Question 10

dew point

Answer 10

•represents the temp to which air would have to be cooled (with no chamge in air pressure or moisture content) for saturation to occur
•good indicator of the air’s actual water vapor content
•high dew points indicate high water vapor content
low dew point = low water vapor content

Question 11

dew

Answer 11

as surface cools below this temp , water vapor begins to condense upon them , forming tiny visible soecks of water

Question 12

frost

Answer 12

delicate white crystals of ice that form in this manner

Question 13

fog

Answer 13

when visibility lowers to less than 1 km & air is west with millions of tiny droplets, the haze becomes a cloud resting near the ground

Question 14

cloud

Answer 14

visible aggregate of tiny water droplets or ice crystals suspended in the air