Heart of the City by Steenz for March 26, 2015
March 25, 2015
March 27, 2015
Transcript:
Dean: Gah! what's happening to my balloons! Heart: Well, it got cold outside...and it says here that helium contracts in the cold, making it easier for the particles to escape. So the balloons are deflating. Dean: Aaargh! I want to fly! I don't want to learn why I can't! Heart: How do you think I feel? You got me reading the school science book!
False! Cooling down a helium-filled balloon will cause it to shrink and sink, but not because it loses helium. Temperature changes affect the density of gases: their density increases as the temperature drops. As a result, the helium reaches a point where it becomes denser than air, and it sinks.