A baby grabs the string of a single helium balloon and floats right out of its baby carriage. Why can't people really float into the air using helium balloons?
What happens to helium balloons in a car when the car stops suddenly?
Helium balloons fly because they're lighter than air. As you walk through air, it's natural to think of air as weighing nothing, though that is not the case.
As your car rapidly decelerates, you feel yourself pushed up against the wheel. Why? Learn more on this Moment of Science.