Making a water clock clepsydra asks your student to fill an upper bottle with water, pierce a small hole in the cap, and invert it over a lower bottle so water drips at a steady rate. Students record the starting and ending water level in milliliters across five measured intervals, log the time elapsed in seconds for each interval, and calculate an average time per interval in the data table provided. Four analysis questions guide your homeschooler to evaluate whether intervals were consistent, identify variables that affected drip speed, propose improvements for accuracy, and connect the experiment to ancient history. This lab suits grades 4 through 7.

The sheet works well as a standalone unit study activity or as an anchor experiment inside a broader physics or ancient civilizations unit. When your student completes all five intervals and works through the analysis questions, they demonstrate an understanding of controlled variables, measurement precision, and the engineering idea that a steady physical process can serve as a clock. The calibration challenge at the bottom pushes further inquiry by asking whether hole size can be tuned to produce exactly one-minute intervals.