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.
Voice pitch decreases tremendously when inhaling SF6 because the speed of sound in SF6 is much less than in air. Sound travels through SF6 at only around 120 m/s, whereas it travels through air at around 340 m/s. Sound travels through helium at around 900 m/s. SF6 is a non-poisonous gas, but should only be inhaled in small quantities (if inhaled at all). It is suggested that one have a tank of pure oxygen gas on hand before demonstrating SF6 inhalation and breathe pure oxygen for about ten breaths before inhaling SF6.