Dew Point and Weather. Measuring the Dew Point Temperature.
-
Upload
maria-pamela-nash -
Category
Documents
-
view
251 -
download
2
Transcript of Dew Point and Weather. Measuring the Dew Point Temperature.
Dew Point and Weather
Measuring the Dew Point Temperature
A review and two questions to think about
• What are the states of matter?
• Can we see water in all its states?
• ====• [1] What connection might
there be to weather?• [2] Where was the water just
before it formed the dew we see?
A Day with Rain
A Day without
Rain
Air Temperature
Dew Point Temperature
Rain
Hurricane Irene2011 (NYC)
WindSpeed & Direction From
Air Temp.& Dew Pt.Temp
48 hours
Some How-To’s
• In lab notebook put date and
____ Air Temp Inside
____ Air Temp Outside
____ Water Temperature Before Ice
____ Dew Point Temperature
• If you have time, see what the coldest temperature you can get to is.
We Need a Way to Represent Our Class Results
• Put values on board … • So we can compare results from the other classes,
we need to come up with ONE number for each measurement that represents our class results
___ Class Air Temp. ____Class Water Temp.____ Class Dew Point Temp.
• How can we do this?
?
Values forAir temp (then waterTemp, thenDew point)
Tape or use magnets to hold results to board, sort, then decide on a number
One possible approach …
< -- put in order -->Air Temp.
Water Temp.
Dew Point Temp.
The Day Before:Monday’s Temperature and Dew Point Temperature
Why might Dr. Stroup have been nervous about our ability to use liquid water (what’s in the cup) to measure dew point. (What happens at 0˚ C? … so to find dew on the side of the cup the water in the cup would need to be …._____?
0 ˚ C
Negative ˚ CWhat state would the water in the cup have to be into measure these dew point temperatures?
Our DataTeacher (Class)
Approx. Time
Time in 24 hours
Class Air Temp.
Class Dew Point Temp.
Plot ClassResults
Graph for Tuesday
Sept. 13, 2011
RainIf farther apart, then evaporation is faster.
If all summer the graphs have been far apart and we’ve had no rain, what does this mean for how dry the plants and trees are? What would this mean if a fire got started?
Tuesday
http://austin.ynn.com/
http://austin.ynn.com/content/top_stories/280357/day-5--1--386-homes-destroyed-in-bastrop?ap=1&MP4 video
Where was the water just before it formed the dew on the side of the cup?
From the water? From the air? How might putting food coloring in the water help us figure this out?
Cloud in a Bottle Activity
Where was the water just beforeit formed into dew or the cloud in the bottle?
Does it “jump up” or is it in the air?
(show movie after cloud in bottle)
Water on earth moves in a continuous cycle. This is called THE WATER CYCLE. There is about the same amount of water on earth now that there was when the dinosaurs roamed our planet
http://www-k12.atmos.washington.edu/k12/pilot/water_cycle/grabber2.html
Water Cycle
End
Web Calculators
• http://www.esa.act.gov.au/firebreak/humidity.html
Type in Air Temp.And Dew PointThen Press Calculate
http://weather.yahoo.com/forecast/USTX0057.html
6/23/06
More information at
• http://www.usatoday.com/weather/whumdef.htm