Create a water clock that times exactly one minute with 3/4 cup of water.
Water clocks are among the most ancient of time pieces, with known examples from Egypt dating to the 16th Century BC. Examples with gears and feedback systems were developed during the Greek and Roman periods.
- Plastic cups
- Modeling clay
- A timer
- Wooden dowel or similar to act as a stand
- Scissors (with adult supervision)
- Push pins
A simple water clock could consist of two plastic cups fixed one above the other with a hole in the top cup to allow water to pass from one to the other.
Additional cups, string, straws, modeling clay, etc. can also be used to create more elaborate examples or to help slow the water if necessary.