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Beginner's
Guide to Rockets
Boyle's Law
Activity
If so instructed
by your teacher, print out a worksheet page for these problems.
Before You Begin:
- Additional
Materials needed per student: 1 sandwich size ziploc bag, 1 straw.
- After reading
the Web page Boyle's Law and
using the Animated
Gas Lab, complete the activity to answer questions using Boyle's
Law.
- Answer
the questions shown below.
- Click on
Animated Gas Lab.
- On the left,
under "Freeze One Variable,"
click on "Mass."
- After viewing
"Mass
is frozen,"
click on "Temperature."
- Next, click
on the green area "Effect of changing
volume on pressure."
- Which variable
is plotted on the graph's vertical axis?
- Which variable
is plotted on the graph's horizontal axis?
- Locate the temperature
gauge. You may need to scroll down. What is the Kelvin temperature?
- Which of the
following conditions is that temperature closer to? room temperature?
human body temperature? freezer temperature?
- The red plunger
is used to exert pressure on the gas molecules in which colored area?
- Complete the
table below as you watch the animated gas lab.
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PRESSURE
|
VOLUME
|
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1.00
|
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1.33
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2.00
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|
- What do you predict
the volume will be when the pressure changes to 4.00?
- Sketch the completed
pressure-volume graph.
- Click on "Effect
of changing pressure on volume." Describe what is added to
the piston to increase the pressure.
- Sketch the completed
volume-pressure graph.
- Write the formula
equation for Boyle's Law.
- Write the equation
for Boyle's Law in words.
- In the Animated
Gas Lab, what are the units of pressure? (Click on Boyle's
Law if you need help.)
- What are the
units of volume used in this lab?
- Predict what
the volume in this lab would be if the pressure were 8.00.
- Predict what
the volume in this lab would be if the pressure were 0.500.
- State Boyle's
law in your own words.
- Zip a sandwich
bag nearly closed. Insert a straw into the opening and blow through
the straw to inflate the bag so that it is a little over half full
of air. Completely seal the bag. Now slowly roll the zipper part of
the bag toward the bottom of the bag, decreasing the volume of the
bag. Describe what happens to the pressure of the air in the bag as
you decrease its volume.
- How does your
experience with the plastic bag compare to the animated gas lab?
- If, in either
situation, instead of having a closed container you had a small opening
in the bottom of it, what would eventually happen to the gas?
- Referring to
the previous question, what would happen to the volume
of the gas in the container?
- Referring to
the previous question, what would happen to the pressure
of the gas?
- Based on the
questions above, hypothesize why a rocket nozzle must constantly have
gas flowing through it in order to maintain pressure.
Related Sites:
Teaching Standards
Worksheet
Rocket Index
Rocket Home
Exploration Systems Mission Directorate Home
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