atmospheric moisture. water in the atmosphere water vapor is the source of all condensation and...
DESCRIPTION
Changes of State Changing states requires energy transfer in the form of heat Latent heat is the stored heat that needs to be added or removed for a phase change to occurTRANSCRIPT
Atmospheric Moisture
Water in the AtmosphereWater vapor is the source of all condensation and precipitation
Essentially all water on Earth is conserved – water cycle
Changes of StateChanging states requires energy transfer in the form of heat
Latent heat is the stored heat that needs to be added or removed for a phase change to occur
Phase changes requiring….The addition of heat:
MeltingEvaporationSublimation – solid directly to gas
The removal of heatFreezingCondensationDeposition – gas directly to solid
Humidity Saturation – the maximum quantity of water vapor air can hold at a given temperature and pressure
Warm air can hold more water vapor than cool air
Relative Humidity (RH)
Ratio of the air’s actual water vapor content compared with the amount of water air can hold at that temperature and pressure
2 ways to change RH1. Add or remove water vapor2. Change the temperature
Relative Humidity (RH) (cont.)
Once air is saturated further cooling causes condensation (ex: dew, clouds)
Measured using a sling psychrometer
Dew PointDew Point –Temperature to which air
would have to be cooled for saturation to occur
Depends on how much moisture is presentFor every 10 C increase in temp. the
amount of water vapor for saturation doubleHigh dew points indicate moist airLow dew point indicate dry air
Using RH and Dew point
Dew point can found by using the RHWhen air temp. and dew point are
close: RH is highWhen air temp. and dew point are
far apart: Rh is low
Explain this…..
Explain the relationship between saturation, relative humidity and dew point.