AskPhysics.com is a website for enabling students as well as others to ask questions and discuss Physics. The site is in Bulletin Board Style and the questions and answers will come in threaded form. Ask Physics has just started and is expected to be a big hit. The clean interface and simplicity adds to its … Continue reading Introducing ASKPHYSICS.COM – A Physics Discussion Site for students
helium balloon raises up slowly through air .why?
Helium balloon raises up slowly through air .why? (Question posted by Siju) Helium is lighter than air and therefore the buoyant force (the upward force exerted by air on the balloon) will be more than the weight of the He filled balloon. So it rises up. As it begins to move upwards, frictional forces (viscous … Continue reading helium balloon raises up slowly through air .why?