Ancient Hero’s Hydraulic Siphon Self-Balancing Fountain
An engaging, screen-free learning activity that builds real-world creativity and critical thinking for kids aged 9 to 14.
Materials Needed
- • Clear plastic drink bottles (500 mL) (3 units)
- • Flexible clear vinyl aquarium tubing (inner diameter 5 mm) (1.5 meters)
- • Hot glue gun and glue sticks (1 set)
- • Water tinted with blue food coloring (2 cups)
Pro Tips
- → Hero of Alexandria invented this motorless fountain in the 1st century AD using air pressure transfer between stacked chambers.
- → Water draining from the top basin down into the bottom sealed bottle pushes air up into the middle water-filled bottle.
- → This compressed air forces water from the middle bottle through a nozzle jet straight up into the air, creating a self-sustaining fountain.
Safety First
Ensure all hot glue bottle joints are completely airtight before testing.
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Step-by-Step Instructions
Step 1
Drill two holes through the bottle caps of two plastic bottles and insert vinyl tubing through each.
Step 2
Seal all tubing connections around the cap holes with hot glue to ensure 100% airtight pneumatic seals.
Step 3
Connect the top open basin, middle water reservoir bottle, and bottom air compression bottle with the tubing network.
Step 4
Pour water into the top basin to prime the system: observe the self-balancing pneumatic compression spray a water fountain into the basin.