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### Beginner's Guide to Propulsion and EngineSim Density Answers

1. Prediction of mass of gas molecules in this classroom. Answers will vary.

2. A. Mass of gas molecules in the classroom. Answers will vary.

B. Materials List:
One meter stick per group.
Density of air = 1.229 kg/meters cubed. (Info in BGP Air Properties Definitions slide.
)

D. Procedure:
Answers will vary but students should list their steps in an orderly fashion and have ready a place to record their measurements. Their procedure should demonstrate their understanding of density = mass/volume.

E. Teacher Check:
The instructor should check that students have thought out their steps before they proceed.

3. A. Answers will vary.

Altitude

What is the relationship between altitude and your variable, ________________? Answers will vary.

B. How does this relationship relate to air density and to the functioning of a gas turbine engine? Answers will vary. Students should become aware that a gas turbine engine needs gas molecules to manipulate to high velocities to create thrust out the back of the engine. The engine uses Newton's third law of motion, action-reaction. As gas molecules become scarce the engine's ability to create thrust becomes more difficult.

C. Reflection: Which atmospheric factors affect air density? Altitude, temperature, and air pressure.

D. Start EngineSim to test your prediction. [Record the results of your test in the table provided below.] Answers will vary.

Altitude
Engine Performance

Related Pages:
Standards
Worksheet
Activity
Propulsion Activity Index
Propulsion Index

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