Which Bottle Rocket Fuel Achieves Higher Altitudes?

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SUMMARY

The discussion centers on the performance of bottle rockets using different fuel densities. It concludes that a bottle filled with a less dense fluid will achieve higher altitudes due to the relationship between gas density and thrust. The speed of sound in gases is inversely related to density, impacting the exit velocity of the gas and, consequently, the upward thrust generated. A lower gas density results in a lighter rocket, enhancing its ability to ascend.

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Bottle Rocket Fuels (URGENT)

Assuming the same volume, which should travel higher - a bottle filled with a dense fluid or a bottle filled with a less dense fluid?
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If you assume the nozzle is only convergent, the gas will exit the bottle at a mach number of unity.

What can you say about the speed of sound and the density of gases?
What is the upward thrust of the exiting gas in terms of exiting velocity?
How does the gas density affect the rocket weight?
 

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