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GEOG 3010 > humidity quiz > Flashcards

humidity quiz Flashcards

1
Q

what is humidity?

A

the quantity of water vapor in the air

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2
Q

is water constant through space & time (the hydrologic cycle)?

A

no

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3
Q

what percent of water vapor in earth’s atmosphere comes from the ocean?

A

85%

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4
Q

what is absolute humidity?

A

mass of water vapor per volume of air
(g/m^3 = volume)

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5
Q

what is specific humidity?

A

mass of water vapor / mass of (all) air

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6
Q

what is mixing ratio?

A

mass of water vapor / mass of dry air

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7
Q

what is vapor pressure?

A

the pressure exerted by water vapor molecules in an air parcel

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8
Q

what percent is vapor pressure of the total air pressure?

A

1% or so

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9
Q

what three phases of water can the atmosphere hold? examples of each?

A

solid (ice crystals, snow, hail)
liquid (rain drops, cloud drops)
gas (water vapor)

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10
Q

what phase changes release latent heat?

A

condensation
freezing
deposition (ice –> vapor or vapor –> ice)

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11
Q

what phase changes cool environment?

A

evaporation
melting
sublimation

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12
Q

can warm air or cold air hold more moisture?

A

warm air

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13
Q

what is saturation vapor pressure?

A

vapor pressure at which an air parcel is saturated
(when condensation = evaporation)

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14
Q

what is relative humidity?

A

(actual water vapor/saturation water vapor) x 100%

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15
Q

what is the temperature at which saturation occurs?

A

dew point

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16
Q

what indicates how close to saturation?

A

relative humidity (RH)

17
Q

what indicates amount of water vapor?

A

dew point

18
Q

high relative humidity equates to…

A

less evaporative cooling

19
Q

which is lighter, humid air or dry air?

A

humid air

20
Q

why is humid air lighter than dry air?

A

due to molecular weight of water compared to nitrogen

21
Q

why does dew form?

A

when they cool to the dew point temperature

22
Q

what is frozen dew?

A

vapor that first condenses and then freezes

23
Q

what does condensation in the atmosphere require?

A

a surface

GEOG 3010 (12 decks)

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