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D - Science - Unit 7

Unit 7 Vocab - Part 1

TermDefinition
Water cycle the movement of water between the atmosphere and earth's surface
Evaporation it the process by which water molecules in liquid water escape into the air as water vapor
Condensation the process by which molecules of water vapor in the air become liquid water
Humidity is the measure of the of the amount of water vapor in the
Relative Humidity is the percentage of water vapor that is actually in the air compared to the maximum amount of water vapor the air can hold at a particular temperature
Dew point the temperature at which condensation begins
Precipitation any form of water that falls from clouds and reaches earth's surface
Cirrus Clouds wispy, feathery clouds made mostly of ice crystals that form at high levels
Cumulus Clouds fluffy, white clouds usually with a flat bottom, that looks like rounded piles cotton
Cumulonimbus Clouds towering clouds with flat tops
Stratus Clouds clouds that form in flat layers and often cover much of the sky
Air Mass a huge body of air that has similar temperature, humidity, and air pressure throughout
Tropical a warm air mass that forms in the tropics and has low air pressure
Polar a cold air mass that forms north of 50 degrees north latitude and south of 50 degrees south latitude and has high air pressure
Maritime a humid air mass that forms over oceans
Continental a dry air mass that forms overland
Maritime Tropical Air Mass warm, humid air masses form over tropical oceans
Maritime Polar Air Mass cool, humid air masses form over icy cold north pacific and north atlantic oceans
Continental Tropical Air Mass hot, dry air mass form mostly in summer over dry areas of the south west and northern mexico
Continental Polar Air Mass cold, dry air masses form over central and northern canada and alaska
Psychrometer the instrument that measures relative humidity
Dew liquid water that condenses from the air onto a cooler surface
Frost ice that has been deposited on a surface that is below freezing
Created by: lprinke