How to Make a Water Clock

A water clock, also known as a clepsydra, is an ancient device used to measure time based on the flow of water. In this guide, you'll learn how to make a simple version of a water clock using household materials. Follow these steps carefully!

Materials Needed

  • Two plastic bottles (1-liter or 2-liter size)
  • One straw
  • Some tape
  • Scissors
  • Water
  • A timer or stopwatch

Instructions

Step 1: Prepare the Bottles

Take the first plastic bottle and turn it upside down. This will be your water reservoir.

Step 2: Create a Hole for the Straw

Use the scissors to make a small hole about halfway up the side of the upside-down bottle. Make sure it’s just big enough for the straw to fit snugly. You want to avoid leaks.

Step 3: Insert the Straw

Take the straw and insert it into the hole you just made. It should extend a few centimeters into the bottle but not touch the bottom. This straw will allow controlled water flow.

Step 4: Tape for Stability

Use tape to secure the straw around the hole to prevent any water from escaping. Make sure the tape is tight and watertight.

Step 5: Prepare the Second Bottle

Place your second bottle upright. This bottle will catch the water. You can mark levels on the side of the bottle with a marker to measure how long it takes to fill up.

Step 6: Fill with Water

Fill the upside-down bottle with water but be careful not to overflow. Then flip it back over so the water can flow through the straw into the second bottle.

Step 7: Start Measuring Time

As the water starts to flow, use a timer or stopwatch to see how long it takes to fill the second bottle to your marked levels. You can adjust the size of the hole in the straw if you want to change the flow rate.

Step 8: Experiment!

Try different variations, like using different bottle sizes or changing the water flow. Observe how your water clock measures time under different conditions!

Conclusion

Making a water clock is a fun and educational project that gives you insight into ancient timekeeping methods. It's also a great way to explore principles of physics and fluid dynamics. Enjoy your timekeeping adventure!


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