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.
This is why people's voices sound so different. Individual variations in our voices are the result of how much tension we put on our vocal folds. For example, relaxing the vocal folds makes a voice deeper; tensing them makes a voice higher. If my voice is hoarse, when should I see my doctor?