In the first century AD, Heron of Alexandria came up with a hydraulic machine that uses the concepts of air pressure and steam. This is what we call the Heron’s fountain — a type of fountain uses perpetual motion to continuously let water flow. It’s actually a great spectacle and can be very nice to look at.
For your next science project, you can reinvent Heron’s fountain using simple materials such as three plastic bottles. Not only will this be attention-grabbing, but you’ll also be demonstrating the importance of recycling.
Image source: Arvind Gupta
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