Intro
Worksheet
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Beginner's Guide
to Propulsion
Air Temperature
Activity
If so instructed
by your teacher, print out a worksheet page for these problems.
Materials:
-
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- 500
ml Erlenmeyer flask (or glass bottle with a mouth small enough
for balloon to fit over)
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Before you begin:
Remember to record observations of the balloon throughout the procedure.
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- Procedure:
- Place water in
the flask to cover the bottom (approximately two centimeters). Boil
the water for three to four minutes. Wait one minute and pour the water
out of the flask. Quickly place an uninflated balloon (just out of the
package) around the mouth of the flask, sealing the flask. Let cool.
- Compare the temperature
of the gas molecules inside the flask with those outside the flask:
A. before the flask was heated
B. after the flask was heated
C. after the balloon was placed on the flask
- How does the change
in temperature affect:
A. the gas molecules' motion?
B. the gas molecules' force?
Note: To help with this question use the slide on Air
Temperature in the Beginner's
Guide to Propulsion.
- Now click Engine
Temperature Ratio (ETR) to note changes in air temperature.
A. What happens to air temperature as air travels through the engine
from stations 0 to 8?
B. How does molecular motion change from stations 0 to 8?
C. What is one function of a gas turbine engine?
- The gas turbine
engine displayed has a temperature variation of 3.5 from station 0 to
station 8. If this engine were functioning at room temperature, what
would be the temperature of the gas at station 8? Note: The
temperature should be in Kelvin units. (K = 273 + Celsius)
- What is the relationship
between air temperature and molecular motion? How did you form this
conclusion?
- What is the relationship
between air temperature and the force of the gas molecules? How did
you form this conclusion?
- After studying
air temperature and gas turbine engines, list three questions that you
or you and your lab partners now have about this topic.
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