Day 011 - Air Temperature and Dewpoint
This is Percy. Percy is a
A temperature called
When the air temperature
When the air temperature
parcel of _______. We can’t
_______________ is
___________, it gets closer
cools enough, Percy
always see it, but parcels
a special number that tells
to the magic temperature.
full, and cannot _________
like Percy can carry some
when the parcel is full. Here
When this happens, Percy
any more water. This means
________________.
Percy is only _______% full.
cannot hold as much
it will start to ____________
This is because air temp is
__________, and the air
whenever air temperature
not close to the __________
feels humid.
and _______________ are
equal.
🔑 MAJOR KEY: _________________________________
_____________________________________________
Day 011 - Air Temperature and Dewpoint
This is Percy. Percy is a
A temperature called
When the air temperature
When the air temperature
parcel of _______. We can’t
_______________ is
___________, it gets closer
cools enough, Percy
always see it, but parcels
a special number that tells
to the magic temperature.
full, and cannot _________
like Percy can carry some
when the parcel is full. Here
When this happens, Percy
any more water. This means
________________.
Percy is only _______% full.
cannot hold as much
it will start to ____________
This is because air temp is
__________, and the air
whenever air temperature
not close to the __________
feels humid.
and _______________ are
equal.
🔑 MAJOR KEY: _________________________________
_____________________________________________
answers to questions 65 through 67 on the diagram below, which shows a hygrometer located on
sroom. The hygrometer’s temperature readings are used by the students to determine the relaof the air in the classroom.
DIAGRAM 1
Psychrometer Diagrams
for Practice
30 Which map shows normal paths followed by low-pressure storm centers as they pass acr
United States?
24 C
O
20 C
O
Dry-bulb
thermometer
Wet-bulb
thermometer
(2)
DIAGRAM
4 (3)
(1)
(4)
31 The diagram below represents the wet-bulb and dry-bulb temperatures on a sling psychrometer.
Wet cloth wick
Reservoir of
water
–25 –20 –15 –10 –5
0 5 10 15 20 25 30 35 40 45 50!C
–25 –20 –15 –10 –5 0 5 10 15 20 25 30 35 40 45 50!C
Wet bulb
34 The diagram below shows three stages in the formation of a specific rock.
Dry bulb
Stage 1
Based on the temperature readings shown in this diagram, determine the relative
humidity of the air in the classroom. [1]
Stage 2
Remains
of partially
decayed
plants
DIAGRAM 2
Stage 3
Burial produces
pressure from overlying
sediments.
Further burial creates
more pressure.
12 The diagram below shows dry-bulb and wet-bulb
block diagram below show the
temperature
readings for
a parcel of
air.
rBesides
after it hasrelative
fallen as precipihumidity, identify
another
weather
variable
of
the air in the classroom
that may be determined by using both temperature readings on the hygrometer. [1]
What was the relative humidity of the air when these temperatures were recorded?
(1) 5%
(3) 20%
Describe how water evaporating from the wick attached to the wet-bulb thermometer
(2) 17%
63%
Which rock is formed as a result of these (4)
three
stages?
2
lowers the temperature reading of that thermometer.
3
Lake
[1]
(1) limestone
(3) schist
DIAGRAM 5
gneiss
(4) coalvariables that they measure?
32 Which set of(2)
instruments
is correctly paired with the weather
wind
speedbelow
– barometer
speed
– wind vane
The
diagram
shows the temperature readings onwind
a weather
instrument.
An4 Earth science class is preparing a booklet on emergency preparedness.35State
one
wind direction – wind vane
wind direction – barometer
safety measure that should be taken to minimize danger from each of the following
w
ater
threats.
[ 3]
(1)
(3)
–15 –10 –5 0 5 10 15 20 25 30 35
a Thunderstorm
Wet bulb
15 speed
20 25– anemometer
30 35
b Tornado
ates
the process of transpirawind speed – anemometer –15 –10 –5 0 5 10
wind
c Volcanic eruption
Dry bulb
(3) 3
(4) 4
oint and wind direction shown
el below?
(2)
(4)
Based on these readings, the relative humidity of the air is closest to
(1) 8%
(3) 32%
(2) 11%
(4) 60%
13 Which atmospheric temperature zone is located
between 8 and 32 miles above Earth’s surface and
contains an abundance of ozone?
(1) troposphere
(3) mesosphere
(2) stratosphere
(4) thermosphere
DIAGRAM 3
[20]
from the northeast
from the southeast
from the northwest
from the southwest
14 Which natural event temporarily slows or
reverses surface ocean currents in the equatorial
region of the Pacific Ocean, causing a disruption
of normal weather patterns?
(1) monsoons
(3) El Niño
(2) volcanic eruptions
(4) deforestation
the lower troposphere at the
sure belt is
sychrometer
nd rising
ferent
rising
drsinking
the wet and
15 Which form of electromagnetic energy has the
longest wavelength?
(1) ultraviolet rays
(3) gamma rays
(2) visible light
(4) radio waves
inking
ewpoint of80a
the wet bulb
s 10°C and
mperature is
wind direction – barometer
What is the dewpoint of the air?
(1) 27°C
(3) 3°C
(2) 10°C
(4) –5°C
002
ding Note
ce
wind direction – wind vane
[3]
[OVER]
is totally full. It also means thatDIAGRAM
any
P.S./E. Sci.–June
’13 “spill out” as rain,
[6]
extra water
will
snow, or fog, depending on other
weather conditions.
If you hear a weather forecaster say that
the relative humidity is 50 percent, it
means that the air contains 50 percent
of the water needed for the air to be
saturated with, or full of, water vapor.
P.S./E. Sci.–August ’10
6
[10]
Determining Dewpoint/Relative
Humidity There are several ways to
measure relative humidity of the air.
Unit 1: Weather Instruments and Maps
One of the simplest ways to do it is with a device called a
psychrometer (SAI kroh meter). A psychrometer is made up of two
thermometers. One, called the dry bulb, has nothing on it and is exposed
Weather Station Model
Diagrams for Practice
DIAGRAM 4
DIAGRAM 2
DIAGRAM 5
DIAGRAM 3
Unit 1: Weather Instruments and Maps
DIAGRAM 6
81
PART 1
Thinking Frame - See, Think, Wonder
QUESTION 1:
What do we
change on the
weather
station model
to show
different
amounts of
cloud cover?
Weather Station Model 1
Weather Station Model 2
Weather Station Model 3
Weather Station Model 4
100% Cloud Cover
50% cloud cover
0% cloud cover
?????? Cloud
Cover
QUESTION 2: What is the cloud cover on weather station model 4?
Weather Station Model 1
Weather Station Model 2
Weather Station Model 3
Weather Station Model 4
Temperature = 25
Dewpoint = 23
Temperature = not given
Dewpoint = not given
Temperature = 37
Dewpoint = 32
Temperature = ???
Dewpoint = ???
QUESTION 3:
What do we
change on the
weather
station model
to show the
temperature/
dewpoint?
QUESTION 4: What are the temperature and dewpoint of weather station model 4?
82
Unit 1: Weather Instruments and Maps
PART 2
Thinking Frame - See, Think, Wonder
Weather Station Model 1
Weather Station Model 2
Weather Station Model 3
Weather Station Model 4
Wind coming from the
southeast
Wind coming from
the northwest
Wind coming from
the southwest
Wind coming from the
??????
QUESTION 5:
What do we
change on the
weather
station model
to show
different wind
direction?
QUESTION 6: What is the wind direction of weather station model 4?
Weather Station Model 1
Weather Station Model 2
Weather Station Model 3
Weather Station Model 4
Wind speed = 20 knots
Wind speed = 5 knots
Wind speed = 15 knots
Wind speed = ???
QUESTION 7:
What do we
change on the
weather
station model
to show
different
wind speeds?
QUESTION 8: What is the wind speed of weather station model 4?
Unit 1: Weather Instruments and Maps
83