Author Archive
Exploding Liquid Nitrogen: Where Does the Energy Come From?
In a new YouTube video, physicists have some fun by dropping a bottle of liquid nitrogen into a garbage can full of water with rubber ducks on top — and it all goes flying within seconds. Dot Physics blogger Rhett Allain explains how something so cold can generate so much force.
Angular Size and the Height of a Space Balloon
A group of school kids launched a large helium-filled balloon into the sky. Dot Physics blogger Rhett Allain uses video analysis and physics equations to estimate just how high the space balloon went.
Guy on an Airbag: Is This Real?
A video on YouTube shows an airbag launching a man into the air — but is it real or fake? Dot Physics blogger Rhett Allain uses video tracking and physics to find out.