'This inert gas alters your voice because sound travels more than twice as fast in it as in air'
helium
SCIENCE: This inert gas alters your voice because sound travels more than twice as fast in it as in air
This inert gas alters your voice because sound travels more than twice as fast in it as in air
This inert gas alters your voice because sound travels more than twice as fast in it as in air
SCIENCE
helium
SCIENCE