Featured Experiments at Steve Spangler Science http://www.stevespanglerscience.com/ en-us Copyright 2013 Steve Spangler Science info@stevespanglerscience.com 720 dda04f9d634145a9c68d5dfe53b21272 Salt Water Density Straw A knowledge of density & air pressure creates a colorful rainbow inside of a drinking straw. http://www.stevespanglerscience.com/experiment/density-straw Salt Water Density Straw