Over the years, you may have seen density stacking activities. Time in a Bottle puts a new twist on an old favorite. Students will have the opportunity to explore liquid volume, intervals of time, and density through this hands-on activity.This is the free version of the activity. A more detailed one is available for a small fee.Education StandardsCCSS.MATH.CONTENT.3.MD.A.2Measure and estimate liquid volumes and masses of objects using standard units of grams (g), kilograms (kg), and liters (