brett said if a new federal government decided to withdraw the workforce supplement funding after the first year dpg had agreed to fund a 3 % increase in the second and third years of the agreement
Pure helium is a medium that allows sound to pass through it more quickly than air, so it makes your voice sound higher pitched (the mechanics are similar to speeding up a video and hearing the sound pitch up). Some gases will do the opposite; most commonly, sulfur hexaflouride, which slows down sound waves.
What gas makes your voice deeper? What is the name of the hormone that makes a boy develop a deep voice when puberty is reached?   The main sex hormone in boys is testosterone and one of its many effects is to stimulate the growth of the Larynx (also called the voice box or Adam's Apple).