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Beginner's Guide to Propulsion
Boyle's Law

Answers will vary. Suggested answers are shown below:

1. Which variable is plotted on the graph's vertical axis? Pressure

2. Which variable is plotted on the graph's horizontal axis? Volume

3.Locate the temperature gauge. What is the Kelvin temperature? Close to 300 K

4.Which of the following conditions is that temperature closer to? room temperature? human body temperature? freezer temperature? Room temperature

5.The red plunger is used to exert pressure on the gas molecules in which colored area ? Yellow

6.Complete the table below as you watch the animated gas lab.


7.What do you predict the volume will be when the pressure becomes 4.00 ? 1

8.Sketch the completed pressure-volume graph below:

  Curved Line from P at top left to V at lower Right

9.Click on "Effect of Changing Pressure on Volume." Describe what is added to the piston to increase the pressure. Green masses are added.

10.Sketch the completed volume-pressure graph below:

 Curved line from V at top left to P at lower right

11.Write the formula equation for Boyle's Law. PV = C

12.Write the equation for Boyle's Law in words. The pressure of a gas times its volume is a constant.

13.In the animated gas lab, the units of pressure are Kilopascals

14.What are the units of volume used in this lab? Cubic meters

15.Predict what the volume in this lab would be if the pressure were 8.00. 0.5

16.Predict what the volume in this lab would be if the pressure were 0.500. 8

17.State Boyle's law in your own words: When the pressure on a gas in a closed container is increased, its volume is decreased. The volume of a gas will increase if the pressure is lowered.

18.Describe what happens to the pressure of the air in the bag as you decrease its volume. The air in the bag exerts more pressure.

19.How does your experience with the plastic bag compare to the animated gas lab? In both cases, increasing pressure results when the volume of the gas is reduced.

20.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? The gas would escape through the opening.

21.Refer to the previous question. What would happen to the volume of the gas in the container? It would decrease until all of the air was pushed out of the bag.

22.Refer to the previous questions. What would happen to the pressure of the gas? It would also decrease because there eventually would be no air left to exert any pressure on the bag.

23.Based on the questions above, hypothesize why a jet engine must constantly have air flowing into it in order to maintain pressure. Since a jet engine is not a closed container, air must constantly flow in to replace the air used in combustion and leaving the nozzle.


Related Pages:
Propulsion Activity Index
Propulsion Index


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Editor: Tom Benson
NASA Official: Tom Benson
Last Updated: Thu, Jun 12 04:39:29 PM EDT 2014

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