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science/chpt 16key4
chapter 16 key terms 4
Question | Answer |
---|---|
evaporation | process by which water molecules in liquid water escape into the air as water vapor |
humidity | a measure of the amount of water vapor in the air |
relative humidity | the percentage of water vapor that is actually in th air compared to the maximum amount of water vapor the air can hold at a particular temperture |
psychrometer | instrument that measures the relative humidity |
condensation | molecules of water vapor in the air become liquid water |
dew point | the temperature at which condensation begins |
cirrus | wispy feathery clouds - means curl of hair - storm is on its way |
cumulus | fluffy rounded piles of cotton - means heap or mass - usually sunny days |
stratus | flat layers - means spread out - dull gray color - as clouds thicken they produce drizzle rain or snow |
relative humidity | measured with an insturment called psychrometer |
clouds form when | water vapor in the air condenses to form liquid water or ice crystals |
clouds classified into three main types based on their shapes and altitude | cirrus, cumulus and stratus |