Wednesday, November 14, 2018


There are many demonstrations on how and why the sky is blue.  But this one might be the simplest.  In this video, Anna Spitz shows how to create a blue sky effect with just a glass of water and a drop of milk.  It is called Rayleigh Scattering.

The AAPT Films Video: Blue Sky in a Cup - Starring Anna Spitz.  Written and Directed by James Lincoln.

Of course, Anna Spitz has already hosted a video about the blue sky in this video from Arbor Scientific:

Check out more videos like these at