The density of helium is much lower than that of air. How does the speed of sound traveling through helium gas compare to the speed of sound in air?

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The Praxis General Science: Content Knowledge (5435) exam is a test required by many states for credential candidates planning to teach science at a high school level. It is a single, computer-delivered test that includes questions from five content domains.

The content categories are Scientific Methodology, Techniques, and History; Physical Science; Life Science; Earth and Space Science; and Science, Technology, and Society.


The density of helium is much lower than that of air. How does the speed of sound traveling through helium gas compare to the speed of sound in air?