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1
2
3The dew point temperature is very complicated to calculate exactly
because it depends on the local atmospheric pressure and temperature, and the
amount of water vapor in the air. There are some ways to estimate dew point
temperature that give a rough idea of what to expect. The following formula is
one of these methods:
100 - P
T
= T
- ---------------
dewpoint
air
5
A general rule-of-thumb is that, if the humidity of the air is 60% you will
feel uncomfortable (P = 60). If the outside temperature on a hot summer’s day is
o
o
o
90
F (T
=90
F) then the dew point temperature is 82
F. If the humidity of the
air
air approaches 100%, then for this example the dew point temperature equals
the air temperature and droplets of moisture will start to form.
Problem 1 – A Marathon runner finishes the race and gets into her car. The
o
outdoor temperature is 75
F and the humidity is 80%. Explain why her actions
may be dangerous if she immediately drives away, and a simple remedy.
Problem 2 - It’s a warm sunny day and the air is rather humid with a dew point of
o
o
75
F .The ground temperature is 85
F. If the air temperature decreases at a rate
o
of 3.5
F/1000 feet (called the wet lapse rate), at what altitude will a cloud begin
to appear?
Problem 3 – On a comfortable summer day, the humidity is only 20% and the
o
outside temperature is 80
F. At what altitude might clouds start to form overhead
o
if the air temperature is decreasing at a ‘dry’ lapse rate of 5.5
F/1000 feet?
Space Math
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