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Water Vapour - Coggle Diagram
Water Vapour
Humidity
Water vapour present in the air
Absolute Humidity
actual amount of the water vapour
temperature difference make no difference
depended:direct on evaporation/ precipitation
highest on equator/ decrease to pole/ high on ocean/lo on land
Specific Humidity
weight of water vapour per unit weight of air
not affected by changes in pressure or temperature
Relative Humidity
percentage of moisture present in the atmosphere as compared to its full capacity at a given temperature
inversely propositional to temperature
Relative humidity is greater over the oceans and least over the continents
determines the amount and rate of evaporation
saturated air
Relative humidity can be changed
By adding moisture through evaporation
By changing temperature of air
basic
gas form of water
varies from zero to four per cent
measured by Hygrometer
Significance
precipitation/water balance/ water cycle
temperature balance/latent head
Evaporation
conversion of water into vapor in high temperature
take place when evaporation surface temperature higher than surrounding temperature
depended: temperature/dryness/ wind speed
highest annual evaporation occur in the sub-tropics of the western North Atlantic and North Pacific because of the influence of the Gulf Stream and the Kurishino Current, and in the trade wind zone of the southern oceans
Dew point
air containing moisture to its full capacity at a given temperature